Finding the Fourth Proportional to 39,985.72, 55,180.74 and 22,080.70

Step by Step Solution

1. Step 1: Write the proportion equation
   39,985.72 : 55,180.74 = 22,080.70 : x
2. Step 2: Convert to fraction form
   39,985.72/55,180.74 = 22,080.70/x
3. Step 3: Cross multiply
   39,985.72x = 55,180.74 × 22,080.70
4. Step 4: Simplify right side
   39,985.72x = 1,218,429,365.72
5. Step 5: Solve for x
   x = 1,218,429,365.72/39,985.72
6. Step 6: Final answer
   x = 30,471.61