Finding the Fourth Proportional to 3,111.27, 4,668.53 and 2,931.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,111.27 : 4,668.53 = 2,931.99 : x
2. Step 2: Convert to fraction form
   3,111.27/4,668.53 = 2,931.99/x
3. Step 3: Cross multiply
   3,111.27x = 4,668.53 × 2,931.99
4. Step 4: Simplify right side
   3,111.27x = 13,688,068.61
5. Step 5: Solve for x
   x = 13,688,068.61/3,111.27
6. Step 6: Final answer
   x = 4,399.51