Finding the Fourth Proportional to 870,949.76, 1,306,088.72 and 338,400.72

Step by Step Solution

1. Step 1: Write the proportion equation
   870,949.76 : 1,306,088.72 = 338,400.72 : x
2. Step 2: Convert to fraction form
   870,949.76/1,306,088.72 = 338,400.72/x
3. Step 3: Cross multiply
   870,949.76x = 1,306,088.72 × 338,400.72
4. Step 4: Simplify right side
   870,949.76x = 441,981,363,231.88
5. Step 5: Solve for x
   x = 441,981,363,231.88/870,949.76
6. Step 6: Final answer
   x = 507,470.56