Finding the Third Proportional to 42,085.50 and 64,683.75

Step by Step Solution

1. Step 1: Write the proportion equation
   42,085.50 : 64,683.75 = 64,683.75 : x
2. Step 2: Convert to fraction form
   42,085.50/64,683.75 = 64,683.75/x
3. Step 3: Cross multiply
   42,085.50x = 64,683.75 × 64,683.75
4. Step 4: Simplify right side
   42,085.50x = 4,183,987,514.06
5. Step 5: Solve for x
   x = 4,183,987,514.06/42,085.50
6. Step 6: Final answer
   x = 99,416.37