Finding the Fourth Proportional to 12,561.72, 17,337.59 and 8,312.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,561.72 : 17,337.59 = 8,312.87 : x
2. Step 2: Convert to fraction form
   12,561.72/17,337.59 = 8,312.87/x
3. Step 3: Cross multiply
   12,561.72x = 17,337.59 × 8,312.87
4. Step 4: Simplify right side
   12,561.72x = 144,125,003.53
5. Step 5: Solve for x
   x = 144,125,003.53/12,561.72
6. Step 6: Final answer
   x = 11,473.35