Finding the Third Proportional to 64,880.25 and 139,759.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,880.25 : 139,759.50 = 139,759.50 : x
2. Step 2: Convert to fraction form
   64,880.25/139,759.50 = 139,759.50/x
3. Step 3: Cross multiply
   64,880.25x = 139,759.50 × 139,759.50
4. Step 4: Simplify right side
   64,880.25x = 19,532,717,840.25
5. Step 5: Solve for x
   x = 19,532,717,840.25/64,880.25
6. Step 6: Final answer
   x = 301,057.99