Finding the Fourth Proportional to 1,399.56, 2,100.24 and 750.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,399.56 : 2,100.24 = 750.72 : x
2. Step 2: Convert to fraction form
   1,399.56/2,100.24 = 750.72/x
3. Step 3: Cross multiply
   1,399.56x = 2,100.24 × 750.72
4. Step 4: Simplify right side
   1,399.56x = 1,576,692.17
5. Step 5: Solve for x
   x = 1,576,692.17/1,399.56
6. Step 6: Final answer
   x = 1,126.56