Finding the Third Proportional to 55,865 and 78,144

Step by Step Solution

1. Step 1: Write the proportion equation
   55,865 : 78,144 = 78,144 : x
2. Step 2: Convert to fraction form
   55,865/78,144 = 78,144/x
3. Step 3: Cross multiply
   55,865x = 78,144 × 78,144
4. Step 4: Simplify right side
   55,865x = 6,106,484,736
5. Step 5: Solve for x
   x = 6,106,484,736/55,865
6. Step 6: Final answer
   x = 109,307.88