Finding the Third Proportional to 621.56 and 907.69

Step by Step Solution

1. Step 1: Write the proportion equation
   621.56 : 907.69 = 907.69 : x
2. Step 2: Convert to fraction form
   621.56/907.69 = 907.69/x
3. Step 3: Cross multiply
   621.56x = 907.69 × 907.69
4. Step 4: Simplify right side
   621.56x = 823,896.60
5. Step 5: Solve for x
   x = 823,896.60/621.56
6. Step 6: Final answer
   x = 1,325.52