Finding the Third Proportional to 66,931.31 and 137,917.69

Step by Step Solution

1. Step 1: Write the proportion equation
   66,931.31 : 137,917.69 = 137,917.69 : x
2. Step 2: Convert to fraction form
   66,931.31/137,917.69 = 137,917.69/x
3. Step 3: Cross multiply
   66,931.31x = 137,917.69 × 137,917.69
4. Step 4: Simplify right side
   66,931.31x = 19,021,288,525.35
5. Step 5: Solve for x
   x = 19,021,288,525.35/66,931.31
6. Step 6: Final answer
   x = 284,191.18