Finding the Third Proportional to 40,318 and 56,391.50

Step by Step Solution

1. Step 1: Write the proportion equation
   40,318 : 56,391.50 = 56,391.50 : x
2. Step 2: Convert to fraction form
   40,318/56,391.50 = 56,391.50/x
3. Step 3: Cross multiply
   40,318x = 56,391.50 × 56,391.50
4. Step 4: Simplify right side
   40,318x = 3,180,001,272.25
5. Step 5: Solve for x
   x = 3,180,001,272.25/40,318
6. Step 6: Final answer
   x = 78,872.99