Finding the Fourth Proportional to 1,399.92, 2,100.24 and 749.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.92 : 2,100.24 = 749.76 : x
2. Step 2: Convert to fraction form
   1,399.92/2,100.24 = 749.76/x
3. Step 3: Cross multiply
   1,399.92x = 2,100.24 × 749.76
4. Step 4: Simplify right side
   1,399.92x = 1,574,675.94
5. Step 5: Solve for x
   x = 1,574,675.94/1,399.92
6. Step 6: Final answer
   x = 1,124.83