Finding the Fourth Proportional to 1,337.58, 2,007.38 and 991.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,337.58 : 2,007.38 = 991.71 : x
2. Step 2: Convert to fraction form
   1,337.58/2,007.38 = 991.71/x
3. Step 3: Cross multiply
   1,337.58x = 2,007.38 × 991.71
4. Step 4: Simplify right side
   1,337.58x = 1,990,741.30
5. Step 5: Solve for x
   x = 1,990,741.30/1,337.58
6. Step 6: Final answer
   x = 1,488.32