Finding the Fourth Proportional to 12,415.31, 17,131.73 and 7,111.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,415.31 : 17,131.73 = 7,111.16 : x
2. Step 2: Convert to fraction form
   12,415.31/17,131.73 = 7,111.16/x
3. Step 3: Cross multiply
   12,415.31x = 17,131.73 × 7,111.16
4. Step 4: Simplify right side
   12,415.31x = 121,826,351.89
5. Step 5: Solve for x
   x = 121,826,351.89/12,415.31
6. Step 6: Final answer
   x = 9,812.59