Finding the Fourth Proportional to 2,920.72, 4,381.12 and 1,630.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,920.72 : 4,381.12 = 1,630.40 : x
2. Step 2: Convert to fraction form
   2,920.72/4,381.12 = 1,630.40/x
3. Step 3: Cross multiply
   2,920.72x = 4,381.12 × 1,630.40
4. Step 4: Simplify right side
   2,920.72x = 7,142,978.05
5. Step 5: Solve for x
   x = 7,142,978.05/2,920.72
6. Step 6: Final answer
   x = 2,445.62