Finding the Third Proportional to 64,858.50 and 139,722.75

Step by Step Solution

1. Step 1: Write the proportion equation
   64,858.50 : 139,722.75 = 139,722.75 : x
2. Step 2: Convert to fraction form
   64,858.50/139,722.75 = 139,722.75/x
3. Step 3: Cross multiply
   64,858.50x = 139,722.75 × 139,722.75
4. Step 4: Simplify right side
   64,858.50x = 19,522,446,867.56
5. Step 5: Solve for x
   x = 19,522,446,867.56/64,858.50
6. Step 6: Final answer
   x = 301,000.59