Finding the Fourth Proportional to 1,921.56, 2,651.34 and 1,224.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,921.56 : 2,651.34 = 1,224.12 : x
2. Step 2: Convert to fraction form
   1,921.56/2,651.34 = 1,224.12/x
3. Step 3: Cross multiply
   1,921.56x = 2,651.34 × 1,224.12
4. Step 4: Simplify right side
   1,921.56x = 3,245,558.32
5. Step 5: Solve for x
   x = 3,245,558.32/1,921.56
6. Step 6: Final answer
   x = 1,689.02