Finding the Fourth Proportional to 2,157.40, 2,978.78 and 1,493.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.40 : 2,978.78 = 1,493.10 : x
2. Step 2: Convert to fraction form
   2,157.40/2,978.78 = 1,493.10/x
3. Step 3: Cross multiply
   2,157.40x = 2,978.78 × 1,493.10
4. Step 4: Simplify right side
   2,157.40x = 4,447,616.42
5. Step 5: Solve for x
   x = 4,447,616.42/2,157.40
6. Step 6: Final answer
   x = 2,061.56