Finding the Fourth Proportional to 86,569.89, 130,062.93 and 81,790.62

Step by Step Solution

1. Step 1: Write the proportion equation
   86,569.89 : 130,062.93 = 81,790.62 : x
2. Step 2: Convert to fraction form
   86,569.89/130,062.93 = 81,790.62/x
3. Step 3: Cross multiply
   86,569.89x = 130,062.93 × 81,790.62
4. Step 4: Simplify right side
   86,569.89x = 10,637,927,683.72
5. Step 5: Solve for x
   x = 10,637,927,683.72/86,569.89
6. Step 6: Final answer
   x = 122,882.54