Finding the Third Proportional to 51,071.25 and 78,760.50

Step by Step Solution

1. Step 1: Write the proportion equation
   51,071.25 : 78,760.50 = 78,760.50 : x
2. Step 2: Convert to fraction form
   51,071.25/78,760.50 = 78,760.50/x
3. Step 3: Cross multiply
   51,071.25x = 78,760.50 × 78,760.50
4. Step 4: Simplify right side
   51,071.25x = 6,203,216,360.25
5. Step 5: Solve for x
   x = 6,203,216,360.25/51,071.25
6. Step 6: Final answer
   x = 121,462.00