Finding the Third Proportional to 161,089.31 and 318,111.75

Step by Step Solution

1. Step 1: Write the proportion equation
   161,089.31 : 318,111.75 = 318,111.75 : x
2. Step 2: Convert to fraction form
   161,089.31/318,111.75 = 318,111.75/x
3. Step 3: Cross multiply
   161,089.31x = 318,111.75 × 318,111.75
4. Step 4: Simplify right side
   161,089.31x = 101,195,085,488.06
5. Step 5: Solve for x
   x = 101,195,085,488.06/161,089.31
6. Step 6: Final answer
   x = 628,192.42