Finding the Fourth Proportional to 1,071.58, 1,479.01 and 697.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.58 : 1,479.01 = 697.89 : x
2. Step 2: Convert to fraction form
   1,071.58/1,479.01 = 697.89/x
3. Step 3: Cross multiply
   1,071.58x = 1,479.01 × 697.89
4. Step 4: Simplify right side
   1,071.58x = 1,032,187.24
5. Step 5: Solve for x
   x = 1,032,187.24/1,071.58
6. Step 6: Final answer
   x = 963.24