Finding the Fourth Proportional to 2,139.60, 2,954.31 and 1,641.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.60 : 2,954.31 = 1,641.45 : x
2. Step 2: Convert to fraction form
   2,139.60/2,954.31 = 1,641.45/x
3. Step 3: Cross multiply
   2,139.60x = 2,954.31 × 1,641.45
4. Step 4: Simplify right side
   2,139.60x = 4,849,352.15
5. Step 5: Solve for x
   x = 4,849,352.15/2,139.60
6. Step 6: Final answer
   x = 2,266.48