Finding the Third Proportional to 64,579.50 and 139,054.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,579.50 : 139,054.50 = 139,054.50 : x
2. Step 2: Convert to fraction form
   64,579.50/139,054.50 = 139,054.50/x
3. Step 3: Cross multiply
   64,579.50x = 139,054.50 × 139,054.50
4. Step 4: Simplify right side
   64,579.50x = 19,336,153,970.25
5. Step 5: Solve for x
   x = 19,336,153,970.25/64,579.50
6. Step 6: Final answer
   x = 299,416.28