Finding the Fourth Proportional to 17,507.72, 26,261.42 and 8,142.50

Step by Step Solution

1. Step 1: Write the proportion equation
   17,507.72 : 26,261.42 = 8,142.50 : x
2. Step 2: Convert to fraction form
   17,507.72/26,261.42 = 8,142.50/x
3. Step 3: Cross multiply
   17,507.72x = 26,261.42 × 8,142.50
4. Step 4: Simplify right side
   17,507.72x = 213,833,481.04
5. Step 5: Solve for x
   x = 213,833,481.04/17,507.72
6. Step 6: Final answer
   x = 12,213.67