Finding the Third Proportional to 64,569 and 99,778.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,569 : 99,778.50 = 99,778.50 : x
2. Step 2: Convert to fraction form
   64,569/99,778.50 = 99,778.50/x
3. Step 3: Cross multiply
   64,569x = 99,778.50 × 99,778.50
4. Step 4: Simplify right side
   64,569x = 9,955,749,062.25
5. Step 5: Solve for x
   x = 9,955,749,062.25/64,569
6. Step 6: Final answer
   x = 154,187.75