Finding the Fourth Proportional to 2,158.63, 2,978.90 and 1,227.13

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.63 : 2,978.90 = 1,227.13 : x
2. Step 2: Convert to fraction form
   2,158.63/2,978.90 = 1,227.13/x
3. Step 3: Cross multiply
   2,158.63x = 2,978.90 × 1,227.13
4. Step 4: Simplify right side
   2,158.63x = 3,655,497.56
5. Step 5: Solve for x
   x = 3,655,497.56/2,158.63
6. Step 6: Final answer
   x = 1,693.43