Finding the Fourth Proportional to 3,061.55, 4,223.90 and 2,116.99

Step by Step Solution

1. Step 1: Write the proportion equation
   3,061.55 : 4,223.90 = 2,116.99 : x
2. Step 2: Convert to fraction form
   3,061.55/4,223.90 = 2,116.99/x
3. Step 3: Cross multiply
   3,061.55x = 4,223.90 × 2,116.99
4. Step 4: Simplify right side
   3,061.55x = 8,941,928.97
5. Step 5: Solve for x
   x = 8,941,928.97/3,061.55
6. Step 6: Final answer
   x = 2,920.72