Finding the Fourth Proportional to 10,549.47, 15,809.61 and 8,981.31

Step by Step Solution

1. Step 1: Write the proportion equation
   10,549.47 : 15,809.61 = 8,981.31 : x
2. Step 2: Convert to fraction form
   10,549.47/15,809.61 = 8,981.31/x
3. Step 3: Cross multiply
   10,549.47x = 15,809.61 × 8,981.31
4. Step 4: Simplify right side
   10,549.47x = 141,991,008.39
5. Step 5: Solve for x
   x = 141,991,008.39/10,549.47
6. Step 6: Final answer
   x = 13,459.54