Finding the Fourth Proportional to 10,142.91, 15,210.71 and 3,899.73

Step by Step Solution

1. Step 1: Write the proportion equation
   10,142.91 : 15,210.71 = 3,899.73 : x
2. Step 2: Convert to fraction form
   10,142.91/15,210.71 = 3,899.73/x
3. Step 3: Cross multiply
   10,142.91x = 15,210.71 × 3,899.73
4. Step 4: Simplify right side
   10,142.91x = 59,317,642.61
5. Step 5: Solve for x
   x = 59,317,642.61/10,142.91
6. Step 6: Final answer
   x = 5,848.19