Finding the Fourth Proportional to 1,439, 2,157.59 and 744.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439 : 2,157.59 = 744.83 : x
2. Step 2: Convert to fraction form
   1,439/2,157.59 = 744.83/x
3. Step 3: Cross multiply
   1,439x = 2,157.59 × 744.83
4. Step 4: Simplify right side
   1,439x = 1,607,037.76
5. Step 5: Solve for x
   x = 1,607,037.76/1,439
6. Step 6: Final answer
   x = 1,116.77