Finding the Fourth Proportional to 1,076.74, 1,614.51 and 638.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.74 : 1,614.51 = 638.05 : x
2. Step 2: Convert to fraction form
   1,076.74/1,614.51 = 638.05/x
3. Step 3: Cross multiply
   1,076.74x = 1,614.51 × 638.05
4. Step 4: Simplify right side
   1,076.74x = 1,030,139.84
5. Step 5: Solve for x
   x = 1,030,139.84/1,076.74
6. Step 6: Final answer
   x = 956.72