Finding the Fourth Proportional to 1,077.89, 1,488.19 and 680.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,077.89 : 1,488.19 = 680.10 : x
2. Step 2: Convert to fraction form
   1,077.89/1,488.19 = 680.10/x
3. Step 3: Cross multiply
   1,077.89x = 1,488.19 × 680.10
4. Step 4: Simplify right side
   1,077.89x = 1,012,109.14
5. Step 5: Solve for x
   x = 1,012,109.14/1,077.89
6. Step 6: Final answer
   x = 938.97