Finding the Third Proportional to 64,911 and 139,516.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,911 : 139,516.50 = 139,516.50 : x
2. Step 2: Convert to fraction form
   64,911/139,516.50 = 139,516.50/x
3. Step 3: Cross multiply
   64,911x = 139,516.50 × 139,516.50
4. Step 4: Simplify right side
   64,911x = 19,464,853,772.25
5. Step 5: Solve for x
   x = 19,464,853,772.25/64,911
6. Step 6: Final answer
   x = 299,869.88