Finding the Third Proportional to 85,429.69 and 128,045.81

Step by Step Solution

1. Step 1: Write the proportion equation
   85,429.69 : 128,045.81 = 128,045.81 : x
2. Step 2: Convert to fraction form
   85,429.69/128,045.81 = 128,045.81/x
3. Step 3: Cross multiply
   85,429.69x = 128,045.81 × 128,045.81
4. Step 4: Simplify right side
   85,429.69x = 16,395,730,098.79
5. Step 5: Solve for x
   x = 16,395,730,098.79/85,429.69
6. Step 6: Final answer
   x = 191,920.75