Finding the Fourth Proportional to 10,908.88, 15,042.72 and 10,021.12

Step by Step Solution

1. Step 1: Write the proportion equation
   10,908.88 : 15,042.72 = 10,021.12 : x
2. Step 2: Convert to fraction form
   10,908.88/15,042.72 = 10,021.12/x
3. Step 3: Cross multiply
   10,908.88x = 15,042.72 × 10,021.12
4. Step 4: Simplify right side
   10,908.88x = 150,744,902.25
5. Step 5: Solve for x
   x = 150,744,902.25/10,908.88
6. Step 6: Final answer
   x = 13,818.55