Finding the Fourth Proportional to 1,399.28, 2,099.86 and 750.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.28 : 2,099.86 = 750.47 : x
2. Step 2: Convert to fraction form
   1,399.28/2,099.86 = 750.47/x
3. Step 3: Cross multiply
   1,399.28x = 2,099.86 × 750.47
4. Step 4: Simplify right side
   1,399.28x = 1,575,869.56
5. Step 5: Solve for x
   x = 1,575,869.56/1,399.28
6. Step 6: Final answer
   x = 1,126.20