Finding the Fourth Proportional to 309,104.31, 426,710.04 and 207,196.34

Step by Step Solution

1. Step 1: Write the proportion equation
   309,104.31 : 426,710.04 = 207,196.34 : x
2. Step 2: Convert to fraction form
   309,104.31/426,710.04 = 207,196.34/x
3. Step 3: Cross multiply
   309,104.31x = 426,710.04 × 207,196.34
4. Step 4: Simplify right side
   309,104.31x = 88,412,755,618.72
5. Step 5: Solve for x
   x = 88,412,755,618.72/309,104.31
6. Step 6: Final answer
   x = 286,028.87