Finding the Third Proportional to 40,690.75 and 89,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   40,690.75 : 89,139.50 = 89,139.50 : x
2. Step 2: Convert to fraction form
   40,690.75/89,139.50 = 89,139.50/x
3. Step 3: Cross multiply
   40,690.75x = 89,139.50 × 89,139.50
4. Step 4: Simplify right side
   40,690.75x = 7,945,850,460.25
5. Step 5: Solve for x
   x = 7,945,850,460.25/40,690.75
6. Step 6: Final answer
   x = 195,274.12