Finding the Fourth Proportional to 15,278.52, 21,081.15 and 9,981.12

Step by Step Solution

1. Step 1: Write the proportion equation
   15,278.52 : 21,081.15 = 9,981.12 : x
2. Step 2: Convert to fraction form
   15,278.52/21,081.15 = 9,981.12/x
3. Step 3: Cross multiply
   15,278.52x = 21,081.15 × 9,981.12
4. Step 4: Simplify right side
   15,278.52x = 210,413,487.89
5. Step 5: Solve for x
   x = 210,413,487.89/15,278.52
6. Step 6: Final answer
   x = 13,771.85