Finding the Fourth Proportional to 656,506.42, 905,978.72 and 354,700.42

Step by Step Solution

1. Step 1: Write the proportion equation
   656,506.42 : 905,978.72 = 354,700.42 : x
2. Step 2: Convert to fraction form
   656,506.42/905,978.72 = 354,700.42/x
3. Step 3: Cross multiply
   656,506.42x = 905,978.72 × 354,700.42
4. Step 4: Simplify right side
   656,506.42x = 321,351,031,116.87
5. Step 5: Solve for x
   x = 321,351,031,116.87/656,506.42
6. Step 6: Final answer
   x = 489,486.50