Finding the Fourth Proportional to 712,689.05, 983,513.72 and 390,401.39

Step by Step Solution

1. Step 1: Write the proportion equation
   712,689.05 : 983,513.72 = 390,401.39 : x
2. Step 2: Convert to fraction form
   712,689.05/983,513.72 = 390,401.39/x
3. Step 3: Cross multiply
   712,689.05x = 983,513.72 × 390,401.39
4. Step 4: Simplify right side
   712,689.05x = 383,965,126,806.86
5. Step 5: Solve for x
   x = 383,965,126,806.86/712,689.05
6. Step 6: Final answer
   x = 538,755.47