Finding the Fourth Proportional to 82,810.10, 124,215.15 and 80,506.10

Step by Step Solution

1. Step 1: Write the proportion equation
   82,810.10 : 124,215.15 = 80,506.10 : x
2. Step 2: Convert to fraction form
   82,810.10/124,215.15 = 80,506.10/x
3. Step 3: Cross multiply
   82,810.10x = 124,215.15 × 80,506.10
4. Step 4: Simplify right side
   82,810.10x = 10,000,077,287.42
5. Step 5: Solve for x
   x = 10,000,077,287.42/82,810.10
6. Step 6: Final answer
   x = 120,759.15