Finding the Third Proportional to 68,429.25 and 140,139

Step by Step Solution

1. Step 1: Write the proportion equation
   68,429.25 : 140,139 = 140,139 : x
2. Step 2: Convert to fraction form
   68,429.25/140,139 = 140,139/x
3. Step 3: Cross multiply
   68,429.25x = 140,139 × 140,139
4. Step 4: Simplify right side
   68,429.25x = 19,638,939,321
5. Step 5: Solve for x
   x = 19,638,939,321/68,429.25
6. Step 6: Final answer
   x = 286,996.27