Finding the Fourth Proportional to 660,853.50, 912,055.59 and 392,581.50

Step by Step Solution

1. Step 1: Write the proportion equation
   660,853.50 : 912,055.59 = 392,581.50 : x
2. Step 2: Convert to fraction form
   660,853.50/912,055.59 = 392,581.50/x
3. Step 3: Cross multiply
   660,853.50x = 912,055.59 × 392,581.50
4. Step 4: Simplify right side
   660,853.50x = 358,056,151,605.59
5. Step 5: Solve for x
   x = 358,056,151,605.59/660,853.50
6. Step 6: Final answer
   x = 541,808.66