Finding the Fourth Proportional to 3,590.72, 5,385.12 and 993.44

Step by Step Solution

1. Step 1: Write the proportion equation
   3,590.72 : 5,385.12 = 993.44 : x
2. Step 2: Convert to fraction form
   3,590.72/5,385.12 = 993.44/x
3. Step 3: Cross multiply
   3,590.72x = 5,385.12 × 993.44
4. Step 4: Simplify right side
   3,590.72x = 5,349,793.61
5. Step 5: Solve for x
   x = 5,349,793.61/3,590.72
6. Step 6: Final answer
   x = 1,489.89