Finding the Third Proportional to 51,120.50 and 78,466.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,120.50 : 78,466.50 = 78,466.50 : x
2. Step 2: Convert to fraction form
   51,120.50/78,466.50 = 78,466.50/x
3. Step 3: Cross multiply
   51,120.50x = 78,466.50 × 78,466.50
4. Step 4: Simplify right side
   51,120.50x = 6,156,991,622.25
5. Step 5: Solve for x
   x = 6,156,991,622.25/51,120.50
6. Step 6: Final answer
   x = 120,440.76