Finding the Fourth Proportional to 2,161.72, 2,983.61 and 1,415.41

Step by Step Solution

1. Step 1: Write the proportion equation
   2,161.72 : 2,983.61 = 1,415.41 : x
2. Step 2: Convert to fraction form
   2,161.72/2,983.61 = 1,415.41/x
3. Step 3: Cross multiply
   2,161.72x = 2,983.61 × 1,415.41
4. Step 4: Simplify right side
   2,161.72x = 4,223,023.53
5. Step 5: Solve for x
   x = 4,223,023.53/2,161.72
6. Step 6: Final answer
   x = 1,953.55