Finding the Fourth Proportional to 83,172.30, 124,564.05 and 81,501.90

Step by Step Solution

1. Step 1: Write the proportion equation
   83,172.30 : 124,564.05 = 81,501.90 : x
2. Step 2: Convert to fraction form
   83,172.30/124,564.05 = 81,501.90/x
3. Step 3: Cross multiply
   83,172.30x = 124,564.05 × 81,501.90
4. Step 4: Simplify right side
   83,172.30x = 10,152,206,746.70
5. Step 5: Solve for x
   x = 10,152,206,746.70/83,172.30
6. Step 6: Final answer
   x = 122,062.35