Finding the Fourth Proportional to 85,677.24, 129,100.89 and 70,436.28

Step by Step Solution

1. Step 1: Write the proportion equation
   85,677.24 : 129,100.89 = 70,436.28 : x
2. Step 2: Convert to fraction form
   85,677.24/129,100.89 = 70,436.28/x
3. Step 3: Cross multiply
   85,677.24x = 129,100.89 × 70,436.28
4. Step 4: Simplify right side
   85,677.24x = 9,093,386,436.29
5. Step 5: Solve for x
   x = 9,093,386,436.29/85,677.24
6. Step 6: Final answer
   x = 106,135.38