Finding the Fourth Proportional to 10,380.48, 15,558.88 and 5,174.72

Step by Step Solution

1. Step 1: Write the proportion equation
   10,380.48 : 15,558.88 = 5,174.72 : x
2. Step 2: Convert to fraction form
   10,380.48/15,558.88 = 5,174.72/x
3. Step 3: Cross multiply
   10,380.48x = 15,558.88 × 5,174.72
4. Step 4: Simplify right side
   10,380.48x = 80,512,847.51
5. Step 5: Solve for x
   x = 80,512,847.51/10,380.48
6. Step 6: Final answer
   x = 7,756.18