Finding the Fourth Proportional to 2,143.63, 3,212.55 and 972.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,143.63 : 3,212.55 = 972.18 : x
2. Step 2: Convert to fraction form
   2,143.63/3,212.55 = 972.18/x
3. Step 3: Cross multiply
   2,143.63x = 3,212.55 × 972.18
4. Step 4: Simplify right side
   2,143.63x = 3,123,176.86
5. Step 5: Solve for x
   x = 3,123,176.86/2,143.63
6. Step 6: Final answer
   x = 1,456.96