Finding the Fourth Proportional to 1,398.58, 2,096.24 and 749.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.58 : 2,096.24 = 749.78 : x
2. Step 2: Convert to fraction form
   1,398.58/2,096.24 = 749.78/x
3. Step 3: Cross multiply
   1,398.58x = 2,096.24 × 749.78
4. Step 4: Simplify right side
   1,398.58x = 1,571,718.83
5. Step 5: Solve for x
   x = 1,571,718.83/1,398.58
6. Step 6: Final answer
   x = 1,123.80