Finding the Fourth Proportional to 811,632.35, 1,217,436.18 and 279,158.00

Step by Step Solution

1. Step 1: Write the proportion equation
   811,632.35 : 1,217,436.18 = 279,158.00 : x
2. Step 2: Convert to fraction form
   811,632.35/1,217,436.18 = 279,158.00/x
3. Step 3: Cross multiply
   811,632.35x = 1,217,436.18 × 279,158.00
4. Step 4: Simplify right side
   811,632.35x = 339,857,042,002.42
5. Step 5: Solve for x
   x = 339,857,042,002.42/811,632.35
6. Step 6: Final answer
   x = 418,732.74