Finding the Third Proportional to 99,991.50 and 140,631

Step by Step Solution

1. Step 1: Write the proportion equation
   99,991.50 : 140,631 = 140,631 : x
2. Step 2: Convert to fraction form
   99,991.50/140,631 = 140,631/x
3. Step 3: Cross multiply
   99,991.50x = 140,631 × 140,631
4. Step 4: Simplify right side
   99,991.50x = 19,777,078,161
5. Step 5: Solve for x
   x = 19,777,078,161/99,991.50
6. Step 6: Final answer
   x = 197,787.59