Finding the Third Proportional to 54,697.50 and 78,216.75

Step by Step Solution

1. Step 1: Write the proportion equation
   54,697.50 : 78,216.75 = 78,216.75 : x
2. Step 2: Convert to fraction form
   54,697.50/78,216.75 = 78,216.75/x
3. Step 3: Cross multiply
   54,697.50x = 78,216.75 × 78,216.75
4. Step 4: Simplify right side
   54,697.50x = 6,117,859,980.56
5. Step 5: Solve for x
   x = 6,117,859,980.56/54,697.50
6. Step 6: Final answer
   x = 111,848.99