Finding the Fourth Proportional to 86,819.31, 129,872.57 and 69,323.31

Step by Step Solution

1. Step 1: Write the proportion equation
   86,819.31 : 129,872.57 = 69,323.31 : x
2. Step 2: Convert to fraction form
   86,819.31/129,872.57 = 69,323.31/x
3. Step 3: Cross multiply
   86,819.31x = 129,872.57 × 69,323.31
4. Step 4: Simplify right side
   86,819.31x = 9,003,196,083.99
5. Step 5: Solve for x
   x = 9,003,196,083.99/86,819.31
6. Step 6: Final answer
   x = 103,700.39