Finding the Fourth Proportional to 2,646.42, 3,969.82 and 698.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,646.42 : 3,969.82 = 698.58 : x
2. Step 2: Convert to fraction form
   2,646.42/3,969.82 = 698.58/x
3. Step 3: Cross multiply
   2,646.42x = 3,969.82 × 698.58
4. Step 4: Simplify right side
   2,646.42x = 2,773,236.86
5. Step 5: Solve for x
   x = 2,773,236.86/2,646.42
6. Step 6: Final answer
   x = 1,047.92