Finding the Third Proportional to 85,510.69 and 134,139.80

Step by Step Solution

1. Step 1: Write the proportion equation
   85,510.69 : 134,139.80 = 134,139.80 : x
2. Step 2: Convert to fraction form
   85,510.69/134,139.80 = 134,139.80/x
3. Step 3: Cross multiply
   85,510.69x = 134,139.80 × 134,139.80
4. Step 4: Simplify right side
   85,510.69x = 17,993,485,105.67
5. Step 5: Solve for x
   x = 17,993,485,105.67/85,510.69
6. Step 6: Final answer
   x = 210,423.82