Finding the Fourth Proportional to 1,978.24, 2,729.74 and 1,138.94

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.24 : 2,729.74 = 1,138.94 : x
2. Step 2: Convert to fraction form
   1,978.24/2,729.74 = 1,138.94/x
3. Step 3: Cross multiply
   1,978.24x = 2,729.74 × 1,138.94
4. Step 4: Simplify right side
   1,978.24x = 3,109,010.08
5. Step 5: Solve for x
   x = 3,109,010.08/1,978.24
6. Step 6: Final answer
   x = 1,571.60