Finding the Fourth Proportional to 86,757, 129,406.23 and 78,784.17

Step by Step Solution

1. Step 1: Write the proportion equation
   86,757 : 129,406.23 = 78,784.17 : x
2. Step 2: Convert to fraction form
   86,757/129,406.23 = 78,784.17/x
3. Step 3: Cross multiply
   86,757x = 129,406.23 × 78,784.17
4. Step 4: Simplify right side
   86,757x = 10,195,162,423.38
5. Step 5: Solve for x
   x = 10,195,162,423.38/86,757
6. Step 6: Final answer
   x = 117,514.00