Finding the Fourth Proportional to 2,157.84, 2,978.24 and 1,273.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,157.84 : 2,978.24 = 1,273.60 : x
2. Step 2: Convert to fraction form
   2,157.84/2,978.24 = 1,273.60/x
3. Step 3: Cross multiply
   2,157.84x = 2,978.24 × 1,273.60
4. Step 4: Simplify right side
   2,157.84x = 3,793,086.46
5. Step 5: Solve for x
   x = 3,793,086.46/2,157.84
6. Step 6: Final answer
   x = 1,757.82