Finding the Fourth Proportional to 10,439.06, 15,663.60 and 5,174.55

Step by Step Solution

1. Step 1: Write the proportion equation
   10,439.06 : 15,663.60 = 5,174.55 : x
2. Step 2: Convert to fraction form
   10,439.06/15,663.60 = 5,174.55/x
3. Step 3: Cross multiply
   10,439.06x = 15,663.60 × 5,174.55
4. Step 4: Simplify right side
   10,439.06x = 81,052,081.38
5. Step 5: Solve for x
   x = 81,052,081.38/10,439.06
6. Step 6: Final answer
   x = 7,764.31