Finding the Third Proportional to 613.20 and 917.89

Step by Step Solution

1. Step 1: Write the proportion equation
   613.20 : 917.89 = 917.89 : x
2. Step 2: Convert to fraction form
   613.20/917.89 = 917.89/x
3. Step 3: Cross multiply
   613.20x = 917.89 × 917.89
4. Step 4: Simplify right side
   613.20x = 842,530.37
5. Step 5: Solve for x
   x = 842,530.37/613.20
6. Step 6: Final answer
   x = 1,374.00