Finding the Fourth Proportional to 748.58, 1,034.05 and 678.72

Step by Step Solution

1. Step 1: Write the proportion equation
   748.58 : 1,034.05 = 678.72 : x
2. Step 2: Convert to fraction form
   748.58/1,034.05 = 678.72/x
3. Step 3: Cross multiply
   748.58x = 1,034.05 × 678.72
4. Step 4: Simplify right side
   748.58x = 701,833.82
5. Step 5: Solve for x
   x = 701,833.82/748.58
6. Step 6: Final answer
   x = 937.55