Finding the Fourth Proportional to 1,016.78, 1,523.37 and 690.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.78 : 1,523.37 = 690.98 : x
2. Step 2: Convert to fraction form
   1,016.78/1,523.37 = 690.98/x
3. Step 3: Cross multiply
   1,016.78x = 1,523.37 × 690.98
4. Step 4: Simplify right side
   1,016.78x = 1,052,618.20
5. Step 5: Solve for x
   x = 1,052,618.20/1,016.78
6. Step 6: Final answer
   x = 1,035.25