Finding the Fourth Proportional to 12,781.72, 17,637.51 and 7,475.50

Step by Step Solution

1. Step 1: Write the proportion equation
   12,781.72 : 17,637.51 = 7,475.50 : x
2. Step 2: Convert to fraction form
   12,781.72/17,637.51 = 7,475.50/x
3. Step 3: Cross multiply
   12,781.72x = 17,637.51 × 7,475.50
4. Step 4: Simplify right side
   12,781.72x = 131,849,161.91
5. Step 5: Solve for x
   x = 131,849,161.91/12,781.72
6. Step 6: Final answer
   x = 10,315.45