Finding the Fourth Proportional to 1,242.12, 1,862.55 and 749.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,242.12 : 1,862.55 = 749.46 : x
2. Step 2: Convert to fraction form
   1,242.12/1,862.55 = 749.46/x
3. Step 3: Cross multiply
   1,242.12x = 1,862.55 × 749.46
4. Step 4: Simplify right side
   1,242.12x = 1,395,906.72
5. Step 5: Solve for x
   x = 1,395,906.72/1,242.12
6. Step 6: Final answer
   x = 1,123.81