Finding the Fourth Proportional to 1,387.96, 2,073.82 and 1,339.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.96 : 2,073.82 = 1,339.53 : x
2. Step 2: Convert to fraction form
   1,387.96/2,073.82 = 1,339.53/x
3. Step 3: Cross multiply
   1,387.96x = 2,073.82 × 1,339.53
4. Step 4: Simplify right side
   1,387.96x = 2,777,944.10
5. Step 5: Solve for x
   x = 2,777,944.10/1,387.96
6. Step 6: Final answer
   x = 2,001.46