Finding the Fourth Proportional to 12,487.91, 17,221.61 and 8,013.07

Step by Step Solution

1. Step 1: Write the proportion equation
   12,487.91 : 17,221.61 = 8,013.07 : x
2. Step 2: Convert to fraction form
   12,487.91/17,221.61 = 8,013.07/x
3. Step 3: Cross multiply
   12,487.91x = 17,221.61 × 8,013.07
4. Step 4: Simplify right side
   12,487.91x = 137,997,840.27
5. Step 5: Solve for x
   x = 137,997,840.27/12,487.91
6. Step 6: Final answer
   x = 11,050.52