Finding the Fourth Proportional to 85,510.90, 128,419.95 and 82,746.10

Step by Step Solution

1. Step 1: Write the proportion equation
   85,510.90 : 128,419.95 = 82,746.10 : x
2. Step 2: Convert to fraction form
   85,510.90/128,419.95 = 82,746.10/x
3. Step 3: Cross multiply
   85,510.90x = 128,419.95 × 82,746.10
4. Step 4: Simplify right side
   85,510.90x = 10,626,250,024.70
5. Step 5: Solve for x
   x = 10,626,250,024.70/85,510.90
6. Step 6: Final answer
   x = 124,267.78