Finding the Third Proportional to 39,412.88 and 86,490.75

Step by Step Solution

1. Step 1: Write the proportion equation
   39,412.88 : 86,490.75 = 86,490.75 : x
2. Step 2: Convert to fraction form
   39,412.88/86,490.75 = 86,490.75/x
3. Step 3: Cross multiply
   39,412.88x = 86,490.75 × 86,490.75
4. Step 4: Simplify right side
   39,412.88x = 7,480,649,835.56
5. Step 5: Solve for x
   x = 7,480,649,835.56/39,412.88
6. Step 6: Final answer
   x = 189,802.19