Finding the Fourth Proportional to 1,440.28, 2,155.77 and 745.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.28 : 2,155.77 = 745.99 : x
2. Step 2: Convert to fraction form
   1,440.28/2,155.77 = 745.99/x
3. Step 3: Cross multiply
   1,440.28x = 2,155.77 × 745.99
4. Step 4: Simplify right side
   1,440.28x = 1,608,182.86
5. Step 5: Solve for x
   x = 1,608,182.86/1,440.28
6. Step 6: Final answer
   x = 1,116.58