Finding the Third Proportional to 51,810.50 and 78,729.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,810.50 : 78,729.50 = 78,729.50 : x
2. Step 2: Convert to fraction form
   51,810.50/78,729.50 = 78,729.50/x
3. Step 3: Cross multiply
   51,810.50x = 78,729.50 × 78,729.50
4. Step 4: Simplify right side
   51,810.50x = 6,198,334,170.25
5. Step 5: Solve for x
   x = 6,198,334,170.25/51,810.50
6. Step 6: Final answer
   x = 119,634.71