Finding the Fourth Proportional to 1,789.78, 2,469.77 and 993.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,789.78 : 2,469.77 = 993.15 : x
2. Step 2: Convert to fraction form
   1,789.78/2,469.77 = 993.15/x
3. Step 3: Cross multiply
   1,789.78x = 2,469.77 × 993.15
4. Step 4: Simplify right side
   1,789.78x = 2,452,852.08
5. Step 5: Solve for x
   x = 2,452,852.08/1,789.78
6. Step 6: Final answer
   x = 1,370.48