Finding the Fourth Proportional to 12,591.50, 17,375.42 and 7,287.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,591.50 : 17,375.42 = 7,287.12 : x
2. Step 2: Convert to fraction form
   12,591.50/17,375.42 = 7,287.12/x
3. Step 3: Cross multiply
   12,591.50x = 17,375.42 × 7,287.12
4. Step 4: Simplify right side
   12,591.50x = 126,616,682.66
5. Step 5: Solve for x
   x = 126,616,682.66/12,591.50
6. Step 6: Final answer
   x = 10,055.72