Finding the Fourth Proportional to 1,665.23, 2,298.33 and 993.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.23 : 2,298.33 = 993.20 : x
2. Step 2: Convert to fraction form
   1,665.23/2,298.33 = 993.20/x
3. Step 3: Cross multiply
   1,665.23x = 2,298.33 × 993.20
4. Step 4: Simplify right side
   1,665.23x = 2,282,689.86
5. Step 5: Solve for x
   x = 2,282,689.86/1,665.23
6. Step 6: Final answer
   x = 1,370.80