Finding the Fourth Proportional to 2,140.57, 2,947.52 and 1,721.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,140.57 : 2,947.52 = 1,721.61 : x
2. Step 2: Convert to fraction form
   2,140.57/2,947.52 = 1,721.61/x
3. Step 3: Cross multiply
   2,140.57x = 2,947.52 × 1,721.61
4. Step 4: Simplify right side
   2,140.57x = 5,074,484.21
5. Step 5: Solve for x
   x = 5,074,484.21/2,140.57
6. Step 6: Final answer
   x = 2,370.63