Finding the Fourth Proportional to 749.69, 1,034.06 and 687.72

Step by Step Solution

1. Step 1: Write the proportion equation
   749.69 : 1,034.06 = 687.72 : x
2. Step 2: Convert to fraction form
   749.69/1,034.06 = 687.72/x
3. Step 3: Cross multiply
   749.69x = 1,034.06 × 687.72
4. Step 4: Simplify right side
   749.69x = 711,140.30
5. Step 5: Solve for x
   x = 711,140.30/749.69
6. Step 6: Final answer
   x = 948.59