Finding the Fourth Proportional to 10,142.48, 15,211.32 and 3,121.52

Step by Step Solution

1. Step 1: Write the proportion equation
   10,142.48 : 15,211.32 = 3,121.52 : x
2. Step 2: Convert to fraction form
   10,142.48/15,211.32 = 3,121.52/x
3. Step 3: Cross multiply
   10,142.48x = 15,211.32 × 3,121.52
4. Step 4: Simplify right side
   10,142.48x = 47,482,439.61
5. Step 5: Solve for x
   x = 47,482,439.61/10,142.48
6. Step 6: Final answer
   x = 4,681.54