Finding the Fourth Proportional to 1,071.12, 1,478.60 and 698.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.12 : 1,478.60 = 698.42 : x
2. Step 2: Convert to fraction form
   1,071.12/1,478.60 = 698.42/x
3. Step 3: Cross multiply
   1,071.12x = 1,478.60 × 698.42
4. Step 4: Simplify right side
   1,071.12x = 1,032,690.56
5. Step 5: Solve for x
   x = 1,032,690.56/1,071.12
6. Step 6: Final answer
   x = 964.12