Finding the Fourth Proportional to 1,200.67, 1,656.79 and 676.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.67 : 1,656.79 = 676.60 : x
2. Step 2: Convert to fraction form
   1,200.67/1,656.79 = 676.60/x
3. Step 3: Cross multiply
   1,200.67x = 1,656.79 × 676.60
4. Step 4: Simplify right side
   1,200.67x = 1,120,978.28
5. Step 5: Solve for x
   x = 1,120,978.28/1,200.67
6. Step 6: Final answer
   x = 933.63