Finding the Fourth Proportional to 1,387.98, 2,082.59 and 738.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.98 : 2,082.59 = 738.77 : x
2. Step 2: Convert to fraction form
   1,387.98/2,082.59 = 738.77/x
3. Step 3: Cross multiply
   1,387.98x = 2,082.59 × 738.77
4. Step 4: Simplify right side
   1,387.98x = 1,538,555.01
5. Step 5: Solve for x
   x = 1,538,555.01/1,387.98
6. Step 6: Final answer
   x = 1,108.49