Finding the Third Proportional to 42,468.75 and 86,782.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,468.75 : 86,782.50 = 86,782.50 : x
2. Step 2: Convert to fraction form
   42,468.75/86,782.50 = 86,782.50/x
3. Step 3: Cross multiply
   42,468.75x = 86,782.50 × 86,782.50
4. Step 4: Simplify right side
   42,468.75x = 7,531,202,306.25
5. Step 5: Solve for x
   x = 7,531,202,306.25/42,468.75
6. Step 6: Final answer
   x = 177,335.15