Finding the Fourth Proportional to 15,587.47, 21,510.71 and 8,513.91

Step by Step Solution

1. Step 1: Write the proportion equation
   15,587.47 : 21,510.71 = 8,513.91 : x
2. Step 2: Convert to fraction form
   15,587.47/21,510.71 = 8,513.91/x
3. Step 3: Cross multiply
   15,587.47x = 21,510.71 × 8,513.91
4. Step 4: Simplify right side
   15,587.47x = 183,140,248.98
5. Step 5: Solve for x
   x = 183,140,248.98/15,587.47
6. Step 6: Final answer
   x = 11,749.20