Finding the Fourth Proportional to 1,038.43, 1,428.84 and 1,013.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,038.43 : 1,428.84 = 1,013.83 : x
2. Step 2: Convert to fraction form
   1,038.43/1,428.84 = 1,013.83/x
3. Step 3: Cross multiply
   1,038.43x = 1,428.84 × 1,013.83
4. Step 4: Simplify right side
   1,038.43x = 1,448,600.86
5. Step 5: Solve for x
   x = 1,448,600.86/1,038.43
6. Step 6: Final answer
   x = 1,394.99