Finding the Fourth Proportional to 1,072.21, 1,478.85 and 699.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.21 : 1,478.85 = 699.52 : x
2. Step 2: Convert to fraction form
   1,072.21/1,478.85 = 699.52/x
3. Step 3: Cross multiply
   1,072.21x = 1,478.85 × 699.52
4. Step 4: Simplify right side
   1,072.21x = 1,034,485.15
5. Step 5: Solve for x
   x = 1,034,485.15/1,072.21
6. Step 6: Final answer
   x = 964.82