Finding the Third Proportional to 56,880.50 and 78,408.75

Step by Step Solution

1. Step 1: Write the proportion equation
   56,880.50 : 78,408.75 = 78,408.75 : x
2. Step 2: Convert to fraction form
   56,880.50/78,408.75 = 78,408.75/x
3. Step 3: Cross multiply
   56,880.50x = 78,408.75 × 78,408.75
4. Step 4: Simplify right side
   56,880.50x = 6,147,932,076.56
5. Step 5: Solve for x
   x = 6,147,932,076.56/56,880.50
6. Step 6: Final answer
   x = 108,085.06