Finding the Fourth Proportional to 10,139.31, 15,191.55 and 9,112.13

Step by Step Solution

1. Step 1: Write the proportion equation
   10,139.31 : 15,191.55 = 9,112.13 : x
2. Step 2: Convert to fraction form
   10,139.31/15,191.55 = 9,112.13/x
3. Step 3: Cross multiply
   10,139.31x = 15,191.55 × 9,112.13
4. Step 4: Simplify right side
   10,139.31x = 138,427,359.51
5. Step 5: Solve for x
   x = 138,427,359.51/10,139.31
6. Step 6: Final answer
   x = 13,652.54