Finding the Fourth Proportional to 915,980.96, 1,374,096.18 and 316,781.30

Step by Step Solution

1. Step 1: Write the proportion equation
   915,980.96 : 1,374,096.18 = 316,781.30 : x
2. Step 2: Convert to fraction form
   915,980.96/1,374,096.18 = 316,781.30/x
3. Step 3: Cross multiply
   915,980.96x = 1,374,096.18 × 316,781.30
4. Step 4: Simplify right side
   915,980.96x = 435,287,974,225.43
5. Step 5: Solve for x
   x = 435,287,974,225.43/915,980.96
6. Step 6: Final answer
   x = 475,215.09