Finding the Third Proportional to 64,420.50 and 138,367.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,420.50 : 138,367.50 = 138,367.50 : x
2. Step 2: Convert to fraction form
   64,420.50/138,367.50 = 138,367.50/x
3. Step 3: Cross multiply
   64,420.50x = 138,367.50 × 138,367.50
4. Step 4: Simplify right side
   64,420.50x = 19,145,565,056.25
5. Step 5: Solve for x
   x = 19,145,565,056.25/64,420.50
6. Step 6: Final answer
   x = 297,196.78