Finding the Fourth Proportional to 1,315.83, 1,815.98 and 983.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,315.83 : 1,815.98 = 983.69 : x
2. Step 2: Convert to fraction form
   1,315.83/1,815.98 = 983.69/x
3. Step 3: Cross multiply
   1,315.83x = 1,815.98 × 983.69
4. Step 4: Simplify right side
   1,315.83x = 1,786,354.18
5. Step 5: Solve for x
   x = 1,786,354.18/1,315.83
6. Step 6: Final answer
   x = 1,357.58