Finding the Fourth Proportional to 83,196.80, 124,600.80 and 81,526.40

Step by Step Solution

1. Step 1: Write the proportion equation
   83,196.80 : 124,600.80 = 81,526.40 : x
2. Step 2: Convert to fraction form
   83,196.80/124,600.80 = 81,526.40/x
3. Step 3: Cross multiply
   83,196.80x = 124,600.80 × 81,526.40
4. Step 4: Simplify right side
   83,196.80x = 10,158,254,661.12
5. Step 5: Solve for x
   x = 10,158,254,661.12/83,196.80
6. Step 6: Final answer
   x = 122,099.10