Finding the Fourth Proportional to 1,978.07, 2,729.94 and 1,138.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.07 : 2,729.94 = 1,138.81 : x
2. Step 2: Convert to fraction form
   1,978.07/2,729.94 = 1,138.81/x
3. Step 3: Cross multiply
   1,978.07x = 2,729.94 × 1,138.81
4. Step 4: Simplify right side
   1,978.07x = 3,108,882.97
5. Step 5: Solve for x
   x = 3,108,882.97/1,978.07
6. Step 6: Final answer
   x = 1,571.67