Finding the Fourth Proportional to 1,439.33, 2,157.72 and 745.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.33 : 2,157.72 = 745.62 : x
2. Step 2: Convert to fraction form
   1,439.33/2,157.72 = 745.62/x
3. Step 3: Cross multiply
   1,439.33x = 2,157.72 × 745.62
4. Step 4: Simplify right side
   1,439.33x = 1,608,839.19
5. Step 5: Solve for x
   x = 1,608,839.19/1,439.33
6. Step 6: Final answer
   x = 1,117.77