Finding the Fourth Proportional to 309,105.31, 426,711.42 and 207,197.34

Step by Step Solution

1. Step 1: Write the proportion equation
   309,105.31 : 426,711.42 = 207,197.34 : x
2. Step 2: Convert to fraction form
   309,105.31/426,711.42 = 207,197.34/x
3. Step 3: Cross multiply
   309,105.31x = 426,711.42 × 207,197.34
4. Step 4: Simplify right side
   309,105.31x = 88,413,471,171.62
5. Step 5: Solve for x
   x = 88,413,471,171.62/309,105.31
6. Step 6: Final answer
   x = 286,030.26