Finding the Fourth Proportional to 85,791.10, 128,546.20 and 82,510.60

Step by Step Solution

1. Step 1: Write the proportion equation
   85,791.10 : 128,546.20 = 82,510.60 : x
2. Step 2: Convert to fraction form
   85,791.10/128,546.20 = 82,510.60/x
3. Step 3: Cross multiply
   85,791.10x = 128,546.20 × 82,510.60
4. Step 4: Simplify right side
   85,791.10x = 10,606,424,089.72
5. Step 5: Solve for x
   x = 10,606,424,089.72/85,791.10
6. Step 6: Final answer
   x = 123,630.82