Finding the Fourth Proportional to 2,120.02, 3,182.38 and 1,243.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,120.02 : 3,182.38 = 1,243.60 : x
2. Step 2: Convert to fraction form
   2,120.02/3,182.38 = 1,243.60/x
3. Step 3: Cross multiply
   2,120.02x = 3,182.38 × 1,243.60
4. Step 4: Simplify right side
   2,120.02x = 3,957,607.77
5. Step 5: Solve for x
   x = 3,957,607.77/2,120.02
6. Step 6: Final answer
   x = 1,866.78