Finding the Third Proportional to 51,009.75 and 78,656.06

Step by Step Solution

1. Step 1: Write the proportion equation
   51,009.75 : 78,656.06 = 78,656.06 : x
2. Step 2: Convert to fraction form
   51,009.75/78,656.06 = 78,656.06/x
3. Step 3: Cross multiply
   51,009.75x = 78,656.06 × 78,656.06
4. Step 4: Simplify right side
   51,009.75x = 6,186,776,168.00
5. Step 5: Solve for x
   x = 6,186,776,168.00/51,009.75
6. Step 6: Final answer
   x = 121,286.15