Finding the Fourth Proportional to 10,505.24, 15,779.72 and 8,864.96

Step by Step Solution

1. Step 1: Write the proportion equation
   10,505.24 : 15,779.72 = 8,864.96 : x
2. Step 2: Convert to fraction form
   10,505.24/15,779.72 = 8,864.96/x
3. Step 3: Cross multiply
   10,505.24x = 15,779.72 × 8,864.96
4. Step 4: Simplify right side
   10,505.24x = 139,886,586.61
5. Step 5: Solve for x
   x = 139,886,586.61/10,505.24
6. Step 6: Final answer
   x = 13,315.89