Finding the Third Proportional to 42,115.50 and 64,719

Step by Step Solution

1. Step 1: Write the proportion equation
   42,115.50 : 64,719 = 64,719 : x
2. Step 2: Convert to fraction form
   42,115.50/64,719 = 64,719/x
3. Step 3: Cross multiply
   42,115.50x = 64,719 × 64,719
4. Step 4: Simplify right side
   42,115.50x = 4,188,548,961
5. Step 5: Solve for x
   x = 4,188,548,961/42,115.50
6. Step 6: Final answer
   x = 99,453.86