Finding the Fourth Proportional to 10,572.72, 15,875.48 and 10,105.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,572.72 : 15,875.48 = 10,105.20 : x
2. Step 2: Convert to fraction form
   10,572.72/15,875.48 = 10,105.20/x
3. Step 3: Cross multiply
   10,572.72x = 15,875.48 × 10,105.20
4. Step 4: Simplify right side
   10,572.72x = 160,424,900.50
5. Step 5: Solve for x
   x = 160,424,900.50/10,572.72
6. Step 6: Final answer
   x = 15,173.47