Finding the Fourth Proportional to 2,158.50, 2,978.74 and 1,227.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.50 : 2,978.74 = 1,227.18 : x
2. Step 2: Convert to fraction form
   2,158.50/2,978.74 = 1,227.18/x
3. Step 3: Cross multiply
   2,158.50x = 2,978.74 × 1,227.18
4. Step 4: Simplify right side
   2,158.50x = 3,655,450.15
5. Step 5: Solve for x
   x = 3,655,450.15/2,158.50
6. Step 6: Final answer
   x = 1,693.51