Finding the Fourth Proportional to 823,209.91, 1,234,856.27 and 262,288.15

Step by Step Solution

1. Step 1: Write the proportion equation
   823,209.91 : 1,234,856.27 = 262,288.15 : x
2. Step 2: Convert to fraction form
   823,209.91/1,234,856.27 = 262,288.15/x
3. Step 3: Cross multiply
   823,209.91x = 1,234,856.27 × 262,288.15
4. Step 4: Simplify right side
   823,209.91x = 323,888,164,142.78
5. Step 5: Solve for x
   x = 323,888,164,142.78/823,209.91
6. Step 6: Final answer
   x = 393,445.42