Finding the Third Proportional to 78,124.50 and 84,685.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,124.50 : 84,685.50 = 84,685.50 : x
2. Step 2: Convert to fraction form
   78,124.50/84,685.50 = 84,685.50/x
3. Step 3: Cross multiply
   78,124.50x = 84,685.50 × 84,685.50
4. Step 4: Simplify right side
   78,124.50x = 7,171,633,910.25
5. Step 5: Solve for x
   x = 7,171,633,910.25/78,124.50
6. Step 6: Final answer
   x = 91,797.50