Finding the Fourth Proportional to 2,168.07, 2,991.98 and 1,224.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.07 : 2,991.98 = 1,224.05 : x
2. Step 2: Convert to fraction form
   2,168.07/2,991.98 = 1,224.05/x
3. Step 3: Cross multiply
   2,168.07x = 2,991.98 × 1,224.05
4. Step 4: Simplify right side
   2,168.07x = 3,662,327.00
5. Step 5: Solve for x
   x = 3,662,327.00/2,168.07
6. Step 6: Final answer
   x = 1,689.21