Finding the Fourth Proportional to 82,111.60, 123,021.60 and 76,862.80

Step by Step Solution

1. Step 1: Write the proportion equation
   82,111.60 : 123,021.60 = 76,862.80 : x
2. Step 2: Convert to fraction form
   82,111.60/123,021.60 = 76,862.80/x
3. Step 3: Cross multiply
   82,111.60x = 123,021.60 × 76,862.80
4. Step 4: Simplify right side
   82,111.60x = 9,455,784,636.48
5. Step 5: Solve for x
   x = 9,455,784,636.48/82,111.60
6. Step 6: Final answer
   x = 115,157.72