Finding the Third Proportional to 91,216.13 and 137,917.69

Step by Step Solution

1. Step 1: Write the proportion equation
   91,216.13 : 137,917.69 = 137,917.69 : x
2. Step 2: Convert to fraction form
   91,216.13/137,917.69 = 137,917.69/x
3. Step 3: Cross multiply
   91,216.13x = 137,917.69 × 137,917.69
4. Step 4: Simplify right side
   91,216.13x = 19,021,288,525.35
5. Step 5: Solve for x
   x = 19,021,288,525.35/91,216.13
6. Step 6: Final answer
   x = 208,529.89