Finding the Fourth Proportional to 1,200.40, 1,656.72 and 676.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,200.40 : 1,656.72 = 676.56 : x
2. Step 2: Convert to fraction form
   1,200.40/1,656.72 = 676.56/x
3. Step 3: Cross multiply
   1,200.40x = 1,656.72 × 676.56
4. Step 4: Simplify right side
   1,200.40x = 1,120,870.48
5. Step 5: Solve for x
   x = 1,120,870.48/1,200.40
6. Step 6: Final answer
   x = 933.75