Finding the Third Proportional to 610.31 and 920.91

Step by Step Solution

1. Step 1: Write the proportion equation
   610.31 : 920.91 = 920.91 : x
2. Step 2: Convert to fraction form
   610.31/920.91 = 920.91/x
3. Step 3: Cross multiply
   610.31x = 920.91 × 920.91
4. Step 4: Simplify right side
   610.31x = 848,068.32
5. Step 5: Solve for x
   x = 848,068.32/610.31
6. Step 6: Final answer
   x = 1,389.56