Finding the Fourth Proportional to 724,667.40, 1,085,688.90 and 619,691.40

Step by Step Solution

1. Step 1: Write the proportion equation
   724,667.40 : 1,085,688.90 = 619,691.40 : x
2. Step 2: Convert to fraction form
   724,667.40/1,085,688.90 = 619,691.40/x
3. Step 3: Cross multiply
   724,667.40x = 1,085,688.90 × 619,691.40
4. Step 4: Simplify right side
   724,667.40x = 672,792,074,405.46
5. Step 5: Solve for x
   x = 672,792,074,405.46/724,667.40
6. Step 6: Final answer
   x = 928,414.99