Finding the Third Proportional to 64,866.76 and 139,434.06

Step by Step Solution

1. Step 1: Write the proportion equation
   64,866.76 : 139,434.06 = 139,434.06 : x
2. Step 2: Convert to fraction form
   64,866.76/139,434.06 = 139,434.06/x
3. Step 3: Cross multiply
   64,866.76x = 139,434.06 × 139,434.06
4. Step 4: Simplify right side
   64,866.76x = 19,441,858,329.92
5. Step 5: Solve for x
   x = 19,441,858,329.92/64,866.76
6. Step 6: Final answer
   x = 299,719.88