Finding the Third Proportional to 42,059.81 and 64,648.78

Step by Step Solution

1. Step 1: Write the proportion equation
   42,059.81 : 64,648.78 = 64,648.78 : x
2. Step 2: Convert to fraction form
   42,059.81/64,648.78 = 64,648.78/x
3. Step 3: Cross multiply
   42,059.81x = 64,648.78 × 64,648.78
4. Step 4: Simplify right side
   42,059.81x = 4,179,464,917.11
5. Step 5: Solve for x
   x = 4,179,464,917.11/42,059.81
6. Step 6: Final answer
   x = 99,369.56