Finding the Fourth Proportional to 86,689.50, 130,060.83 and 77,748.33

Step by Step Solution

1. Step 1: Write the proportion equation
   86,689.50 : 130,060.83 = 77,748.33 : x
2. Step 2: Convert to fraction form
   86,689.50/130,060.83 = 77,748.33/x
3. Step 3: Cross multiply
   86,689.50x = 130,060.83 × 77,748.33
4. Step 4: Simplify right side
   86,689.50x = 10,112,012,330.91
5. Step 5: Solve for x
   x = 10,112,012,330.91/86,689.50
6. Step 6: Final answer
   x = 116,646.33