Finding the Fourth Proportional to 1,978.01, 2,729.43 and 1,138.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,978.01 : 2,729.43 = 1,138.76 : x
2. Step 2: Convert to fraction form
   1,978.01/2,729.43 = 1,138.76/x
3. Step 3: Cross multiply
   1,978.01x = 2,729.43 × 1,138.76
4. Step 4: Simplify right side
   1,978.01x = 3,108,165.71
5. Step 5: Solve for x
   x = 3,108,165.71/1,978.01
6. Step 6: Final answer
   x = 1,571.36