Finding the Fourth Proportional to 4,812.50, 6,642.38 and 3,131

Step by Step Solution

1. Step 1: Write the proportion equation
   4,812.50 : 6,642.38 = 3,131 : x
2. Step 2: Convert to fraction form
   4,812.50/6,642.38 = 3,131/x
3. Step 3: Cross multiply
   4,812.50x = 6,642.38 × 3,131
4. Step 4: Simplify right side
   4,812.50x = 20,797,291.78
5. Step 5: Solve for x
   x = 20,797,291.78/4,812.50
6. Step 6: Final answer
   x = 4,321.52