Finding the Fourth Proportional to 627,389.31, 865,802.72 and 340,909.39

Step by Step Solution

1. Step 1: Write the proportion equation
   627,389.31 : 865,802.72 = 340,909.39 : x
2. Step 2: Convert to fraction form
   627,389.31/865,802.72 = 340,909.39/x
3. Step 3: Cross multiply
   627,389.31x = 865,802.72 × 340,909.39
4. Step 4: Simplify right side
   627,389.31x = 295,160,272,806.53
5. Step 5: Solve for x
   x = 295,160,272,806.53/627,389.31
6. Step 6: Final answer
   x = 470,457.92