Finding the Third Proportional to 86,864.91 and 188,389.55

Step by Step Solution

1. Step 1: Write the proportion equation
   86,864.91 : 188,389.55 = 188,389.55 : x
2. Step 2: Convert to fraction form
   86,864.91/188,389.55 = 188,389.55/x
3. Step 3: Cross multiply
   86,864.91x = 188,389.55 × 188,389.55
4. Step 4: Simplify right side
   86,864.91x = 35,490,621,371.77
5. Step 5: Solve for x
   x = 35,490,621,371.77/86,864.91
6. Step 6: Final answer
   x = 408,572.61