Finding the Fourth Proportional to 1,987.28, 2,978.73 and 1,060.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,987.28 : 2,978.73 = 1,060.54 : x
2. Step 2: Convert to fraction form
   1,987.28/2,978.73 = 1,060.54/x
3. Step 3: Cross multiply
   1,987.28x = 2,978.73 × 1,060.54
4. Step 4: Simplify right side
   1,987.28x = 3,159,047.42
5. Step 5: Solve for x
   x = 3,159,047.42/1,987.28
6. Step 6: Final answer
   x = 1,589.63