Finding the Third Proportional to 39,781.13 and 87,216.75

Step by Step Solution

1. Step 1: Write the proportion equation
   39,781.13 : 87,216.75 = 87,216.75 : x
2. Step 2: Convert to fraction form
   39,781.13/87,216.75 = 87,216.75/x
3. Step 3: Cross multiply
   39,781.13x = 87,216.75 × 87,216.75
4. Step 4: Simplify right side
   39,781.13x = 7,606,761,480.56
5. Step 5: Solve for x
   x = 7,606,761,480.56/39,781.13
6. Step 6: Final answer
   x = 191,215.34