Finding the Fourth Proportional to 86,568.89, 130,061.43 and 81,789.62

Step by Step Solution

1. Step 1: Write the proportion equation
   86,568.89 : 130,061.43 = 81,789.62 : x
2. Step 2: Convert to fraction form
   86,568.89/130,061.43 = 81,789.62/x
3. Step 3: Cross multiply
   86,568.89x = 130,061.43 × 81,789.62
4. Step 4: Simplify right side
   86,568.89x = 10,637,674,286.05
5. Step 5: Solve for x
   x = 10,637,674,286.05/86,568.89
6. Step 6: Final answer
   x = 122,881.04