Finding the Third Proportional to 109,660.50 and 239,139

Step by Step Solution

1. Step 1: Write the proportion equation
   109,660.50 : 239,139 = 239,139 : x
2. Step 2: Convert to fraction form
   109,660.50/239,139 = 239,139/x
3. Step 3: Cross multiply
   109,660.50x = 239,139 × 239,139
4. Step 4: Simplify right side
   109,660.50x = 57,187,461,321
5. Step 5: Solve for x
   x = 57,187,461,321/109,660.50
6. Step 6: Final answer
   x = 521,495.54