Finding the Fourth Proportional to 1,072.50, 1,479.03 and 699.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,072.50 : 1,479.03 = 699.77 : x
2. Step 2: Convert to fraction form
   1,072.50/1,479.03 = 699.77/x
3. Step 3: Cross multiply
   1,072.50x = 1,479.03 × 699.77
4. Step 4: Simplify right side
   1,072.50x = 1,034,980.82
5. Step 5: Solve for x
   x = 1,034,980.82/1,072.50
6. Step 6: Final answer
   x = 965.02