Finding the Fourth Proportional to 1,986.10, 2,978.89 and 753.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,986.10 : 2,978.89 = 753.17 : x
2. Step 2: Convert to fraction form
   1,986.10/2,978.89 = 753.17/x
3. Step 3: Cross multiply
   1,986.10x = 2,978.89 × 753.17
4. Step 4: Simplify right side
   1,986.10x = 2,243,610.58
5. Step 5: Solve for x
   x = 2,243,610.58/1,986.10
6. Step 6: Final answer
   x = 1,129.66