Finding the Fourth Proportional to 1,358.15, 2,038.59 and 991.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.15 : 2,038.59 = 991.83 : x
2. Step 2: Convert to fraction form
   1,358.15/2,038.59 = 991.83/x
3. Step 3: Cross multiply
   1,358.15x = 2,038.59 × 991.83
4. Step 4: Simplify right side
   1,358.15x = 2,021,933.69
5. Step 5: Solve for x
   x = 2,021,933.69/1,358.15
6. Step 6: Final answer
   x = 1,488.74