Finding the Fourth Proportional to 10,154.31, 15,231.78 and 2,758.74

Step by Step Solution

1. Step 1: Write the proportion equation
   10,154.31 : 15,231.78 = 2,758.74 : x
2. Step 2: Convert to fraction form
   10,154.31/15,231.78 = 2,758.74/x
3. Step 3: Cross multiply
   10,154.31x = 15,231.78 × 2,758.74
4. Step 4: Simplify right side
   10,154.31x = 42,020,520.76
5. Step 5: Solve for x
   x = 42,020,520.76/10,154.31
6. Step 6: Final answer
   x = 4,138.20