Finding the Fourth Proportional to 1,298.98, 1,788.07 and 983.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.98 : 1,788.07 = 983.69 : x
2. Step 2: Convert to fraction form
   1,298.98/1,788.07 = 983.69/x
3. Step 3: Cross multiply
   1,298.98x = 1,788.07 × 983.69
4. Step 4: Simplify right side
   1,298.98x = 1,758,892.72
5. Step 5: Solve for x
   x = 1,758,892.72/1,298.98
6. Step 6: Final answer
   x = 1,354.06