Finding the Fourth Proportional to 2,517.72, 3,771.72 and 1,220.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,517.72 : 3,771.72 = 1,220.10 : x
2. Step 2: Convert to fraction form
   2,517.72/3,771.72 = 1,220.10/x
3. Step 3: Cross multiply
   2,517.72x = 3,771.72 × 1,220.10
4. Step 4: Simplify right side
   2,517.72x = 4,601,875.57
5. Step 5: Solve for x
   x = 4,601,875.57/2,517.72
6. Step 6: Final answer
   x = 1,827.79