Finding the Third Proportional to 64,868.63 and 139,439.25

Step by Step Solution

1. Step 1: Write the proportion equation
   64,868.63 : 139,439.25 = 139,439.25 : x
2. Step 2: Convert to fraction form
   64,868.63/139,439.25 = 139,439.25/x
3. Step 3: Cross multiply
   64,868.63x = 139,439.25 × 139,439.25
4. Step 4: Simplify right side
   64,868.63x = 19,443,304,440.56
5. Step 5: Solve for x
   x = 19,443,304,440.56/64,868.63
6. Step 6: Final answer
   x = 299,733.57