Finding the Fourth Proportional to 1,978.16, 2,729.92 and 1,138.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.16 : 2,729.92 = 1,138.92 : x
2. Step 2: Convert to fraction form
   1,978.16/2,729.92 = 1,138.92/x
3. Step 3: Cross multiply
   1,978.16x = 2,729.92 × 1,138.92
4. Step 4: Simplify right side
   1,978.16x = 3,109,160.49
5. Step 5: Solve for x
   x = 3,109,160.49/1,978.16
6. Step 6: Final answer
   x = 1,571.74