Finding the Fourth Proportional to 10,572.30, 15,865.71 and 10,490.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,572.30 : 15,865.71 = 10,490.28 : x
2. Step 2: Convert to fraction form
   10,572.30/15,865.71 = 10,490.28/x
3. Step 3: Cross multiply
   10,572.30x = 15,865.71 × 10,490.28
4. Step 4: Simplify right side
   10,572.30x = 166,435,740.30
5. Step 5: Solve for x
   x = 166,435,740.30/10,572.30
6. Step 6: Final answer
   x = 15,742.62