Finding the Fourth Proportional to 10,368.42, 15,540.47 and 5,105.85

Step by Step Solution

1. Step 1: Write the proportion equation
   10,368.42 : 15,540.47 = 5,105.85 : x
2. Step 2: Convert to fraction form
   10,368.42/15,540.47 = 5,105.85/x
3. Step 3: Cross multiply
   10,368.42x = 15,540.47 × 5,105.85
4. Step 4: Simplify right side
   10,368.42x = 79,347,308.75
5. Step 5: Solve for x
   x = 79,347,308.75/10,368.42
6. Step 6: Final answer
   x = 7,652.79