Finding the Third Proportional to 42,617.81 and 89,638.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42,617.81 : 89,638.31 = 89,638.31 : x
2. Step 2: Convert to fraction form
   42,617.81/89,638.31 = 89,638.31/x
3. Step 3: Cross multiply
   42,617.81x = 89,638.31 × 89,638.31
4. Step 4: Simplify right side
   42,617.81x = 8,035,027,067.85
5. Step 5: Solve for x
   x = 8,035,027,067.85/42,617.81
6. Step 6: Final answer
   x = 188,536.83