Finding the Fourth Proportional to 11,501.89, 15,871.71 and 6,465.15

Step by Step Solution

1. Step 1: Write the proportion equation
   11,501.89 : 15,871.71 = 6,465.15 : x
2. Step 2: Convert to fraction form
   11,501.89/15,871.71 = 6,465.15/x
3. Step 3: Cross multiply
   11,501.89x = 15,871.71 × 6,465.15
4. Step 4: Simplify right side
   11,501.89x = 102,612,985.91
5. Step 5: Solve for x
   x = 102,612,985.91/11,501.89
6. Step 6: Final answer
   x = 8,921.40