Finding the Fourth Proportional to 83,385.18, 115,087.86 and 65,199.96

Step by Step Solution

1. Step 1: Write the proportion equation
   83,385.18 : 115,087.86 = 65,199.96 : x
2. Step 2: Convert to fraction form
   83,385.18/115,087.86 = 65,199.96/x
3. Step 3: Cross multiply
   83,385.18x = 115,087.86 × 65,199.96
4. Step 4: Simplify right side
   83,385.18x = 7,503,723,868.49
5. Step 5: Solve for x
   x = 7,503,723,868.49/83,385.18
6. Step 6: Final answer
   x = 89,988.70