Finding the Fourth Proportional to 405,978,020.76, 560,255,043.42 and 220,341,261.72

Step by Step Solution

1. Step 1: Write the proportion equation
   405,978,020.76 : 560,255,043.42 = 220,341,261.72 : x
2. Step 2: Convert to fraction form
   405,978,020.76/560,255,043.42 = 220,341,261.72/x
3. Step 3: Cross multiply
   405,978,020.76x = 560,255,043.42 × 220,341,261.72
4. Step 4: Simplify right side
   405,978,020.76x = 123,447,303,152,156,176
5. Step 5: Solve for x
   x = 123,447,303,152,156,176/405,978,020.76
6. Step 6: Final answer
   x = 304,073,858.29