Finding the Fourth Proportional to 12,617.86, 17,411.72 and 7,312.57

Step by Step Solution

1. Step 1: Write the proportion equation
   12,617.86 : 17,411.72 = 7,312.57 : x
2. Step 2: Convert to fraction form
   12,617.86/17,411.72 = 7,312.57/x
3. Step 3: Cross multiply
   12,617.86x = 17,411.72 × 7,312.57
4. Step 4: Simplify right side
   12,617.86x = 127,324,421.32
5. Step 5: Solve for x
   x = 127,324,421.32/12,617.86
6. Step 6: Final answer
   x = 10,090.81