Finding the Fourth Proportional to 10,572.72, 15,858.15 and 6,411.50

Step by Step Solution

1. Step 1: Write the proportion equation
   10,572.72 : 15,858.15 = 6,411.50 : x
2. Step 2: Convert to fraction form
   10,572.72/15,858.15 = 6,411.50/x
3. Step 3: Cross multiply
   10,572.72x = 15,858.15 × 6,411.50
4. Step 4: Simplify right side
   10,572.72x = 101,674,528.73
5. Step 5: Solve for x
   x = 101,674,528.73/10,572.72
6. Step 6: Final answer
   x = 9,616.69