Finding the Fourth Proportional to 1,439.29, 2,156.78 and 745.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.29 : 2,156.78 = 745.03 : x
2. Step 2: Convert to fraction form
   1,439.29/2,156.78 = 745.03/x
3. Step 3: Cross multiply
   1,439.29x = 2,156.78 × 745.03
4. Step 4: Simplify right side
   1,439.29x = 1,606,855.02
5. Step 5: Solve for x
   x = 1,606,855.02/1,439.29
6. Step 6: Final answer
   x = 1,116.43