Finding the Third Proportional to 91,509.75 and 139,026.38

Step by Step Solution

1. Step 1: Write the proportion equation
   91,509.75 : 139,026.38 = 139,026.38 : x
2. Step 2: Convert to fraction form
   91,509.75/139,026.38 = 139,026.38/x
3. Step 3: Cross multiply
   91,509.75x = 139,026.38 × 139,026.38
4. Step 4: Simplify right side
   91,509.75x = 19,328,332,945.64
5. Step 5: Solve for x
   x = 19,328,332,945.64/91,509.75
6. Step 6: Final answer
   x = 211,216.10