Finding the Fourth Proportional to 2,168.61, 2,992.86 and 1,224.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.61 : 2,992.86 = 1,224.57 : x
2. Step 2: Convert to fraction form
   2,168.61/2,992.86 = 1,224.57/x
3. Step 3: Cross multiply
   2,168.61x = 2,992.86 × 1,224.57
4. Step 4: Simplify right side
   2,168.61x = 3,664,966.57
5. Step 5: Solve for x
   x = 3,664,966.57/2,168.61
6. Step 6: Final answer
   x = 1,690.01