Finding the Fourth Proportional to 1,986.32, 2,978.82 and 752.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.32 : 2,978.82 = 752.78 : x
2. Step 2: Convert to fraction form
   1,986.32/2,978.82 = 752.78/x
3. Step 3: Cross multiply
   1,986.32x = 2,978.82 × 752.78
4. Step 4: Simplify right side
   1,986.32x = 2,242,396.12
5. Step 5: Solve for x
   x = 2,242,396.12/1,986.32
6. Step 6: Final answer
   x = 1,128.92