Finding the Fourth Proportional to 10,215.31, 15,308.61 and 8,126.05

Step by Step Solution

1. Step 1: Write the proportion equation
   10,215.31 : 15,308.61 = 8,126.05 : x
2. Step 2: Convert to fraction form
   10,215.31/15,308.61 = 8,126.05/x
3. Step 3: Cross multiply
   10,215.31x = 15,308.61 × 8,126.05
4. Step 4: Simplify right side
   10,215.31x = 124,398,518.95
5. Step 5: Solve for x
   x = 124,398,518.95/10,215.31
6. Step 6: Final answer
   x = 12,177.65