Finding the Fourth Proportional to 2,158.02, 2,978.01 and 1,213.92

Step by Step Solution

1. Step 1: Write the proportion equation
   2,158.02 : 2,978.01 = 1,213.92 : x
2. Step 2: Convert to fraction form
   2,158.02/2,978.01 = 1,213.92/x
3. Step 3: Cross multiply
   2,158.02x = 2,978.01 × 1,213.92
4. Step 4: Simplify right side
   2,158.02x = 3,615,065.90
5. Step 5: Solve for x
   x = 3,615,065.90/2,158.02
6. Step 6: Final answer
   x = 1,675.18