Finding the Fourth Proportional to 1,399.90, 2,097.69 and 748.66

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.90 : 2,097.69 = 748.66 : x
2. Step 2: Convert to fraction form
   1,399.90/2,097.69 = 748.66/x
3. Step 3: Cross multiply
   1,399.90x = 2,097.69 × 748.66
4. Step 4: Simplify right side
   1,399.90x = 1,570,456.60
5. Step 5: Solve for x
   x = 1,570,456.60/1,399.90
6. Step 6: Final answer
   x = 1,121.83