Finding the Fourth Proportional to 2,940.31, 4,412.20 and 1,092.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,940.31 : 4,412.20 = 1,092.72 : x
2. Step 2: Convert to fraction form
   2,940.31/4,412.20 = 1,092.72/x
3. Step 3: Cross multiply
   2,940.31x = 4,412.20 × 1,092.72
4. Step 4: Simplify right side
   2,940.31x = 4,821,299.18
5. Step 5: Solve for x
   x = 4,821,299.18/2,940.31
6. Step 6: Final answer
   x = 1,639.72