Finding the Fourth Proportional to 1,071.61, 1,479.25 and 698.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.61 : 1,479.25 = 698.91 : x
2. Step 2: Convert to fraction form
   1,071.61/1,479.25 = 698.91/x
3. Step 3: Cross multiply
   1,071.61x = 1,479.25 × 698.91
4. Step 4: Simplify right side
   1,071.61x = 1,033,862.62
5. Step 5: Solve for x
   x = 1,033,862.62/1,071.61
6. Step 6: Final answer
   x = 964.78