Finding the Third Proportional to 68,890.50 and 105,386.06

Step by Step Solution

1. Step 1: Write the proportion equation
   68,890.50 : 105,386.06 = 105,386.06 : x
2. Step 2: Convert to fraction form
   68,890.50/105,386.06 = 105,386.06/x
3. Step 3: Cross multiply
   68,890.50x = 105,386.06 × 105,386.06
4. Step 4: Simplify right side
   68,890.50x = 11,106,222,169.25
5. Step 5: Solve for x
   x = 11,106,222,169.25/68,890.50
6. Step 6: Final answer
   x = 161,215.58