Finding the Fourth Proportional to 7,002.72, 10,506.24 and 4,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,002.72 : 10,506.24 = 4,086.72 : x
2. Step 2: Convert to fraction form
   7,002.72/10,506.24 = 4,086.72/x
3. Step 3: Cross multiply
   7,002.72x = 10,506.24 × 4,086.72
4. Step 4: Simplify right side
   7,002.72x = 42,936,061.13
5. Step 5: Solve for x
   x = 42,936,061.13/7,002.72
6. Step 6: Final answer
   x = 6,131.34