Finding the Fourth Proportional to 17,139.57, 25,717.86 and 11,580.72

Step by Step Solution

1. Step 1: Write the proportion equation
   17,139.57 : 25,717.86 = 11,580.72 : x
2. Step 2: Convert to fraction form
   17,139.57/25,717.86 = 11,580.72/x
3. Step 3: Cross multiply
   17,139.57x = 25,717.86 × 11,580.72
4. Step 4: Simplify right side
   17,139.57x = 297,831,335.66
5. Step 5: Solve for x
   x = 297,831,335.66/17,139.57
6. Step 6: Final answer
   x = 17,376.83