Finding the Fourth Proportional to 1,320.67, 1,978.34 and 628.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,320.67 : 1,978.34 = 628.01 : x
2. Step 2: Convert to fraction form
   1,320.67/1,978.34 = 628.01/x
3. Step 3: Cross multiply
   1,320.67x = 1,978.34 × 628.01
4. Step 4: Simplify right side
   1,320.67x = 1,242,408.98
5. Step 5: Solve for x
   x = 1,242,408.98/1,320.67
6. Step 6: Final answer
   x = 940.74