Finding the Fourth Proportional to 693,318, 956,785.20 and 406,842.72

Step by Step Solution

1. Step 1: Write the proportion equation
   693,318 : 956,785.20 = 406,842.72 : x
2. Step 2: Convert to fraction form
   693,318/956,785.20 = 406,842.72/x
3. Step 3: Cross multiply
   693,318x = 956,785.20 × 406,842.72
4. Step 4: Simplify right side
   693,318x = 389,261,093,223.74
5. Step 5: Solve for x
   x = 389,261,093,223.74/693,318
6. Step 6: Final answer
   x = 561,446.69