Finding the Fourth Proportional to 10,142.75, 15,219.48 and 7,200.20

Step by Step Solution

1. Step 1: Write the proportion equation
   10,142.75 : 15,219.48 = 7,200.20 : x
2. Step 2: Convert to fraction form
   10,142.75/15,219.48 = 7,200.20/x
3. Step 3: Cross multiply
   10,142.75x = 15,219.48 × 7,200.20
4. Step 4: Simplify right side
   10,142.75x = 109,583,223.80
5. Step 5: Solve for x
   x = 109,583,223.80/10,142.75
6. Step 6: Final answer
   x = 10,804.10