Finding the Third Proportional to 64,488.75 and 99,649.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,488.75 : 99,649.50 = 99,649.50 : x
2. Step 2: Convert to fraction form
   64,488.75/99,649.50 = 99,649.50/x
3. Step 3: Cross multiply
   64,488.75x = 99,649.50 × 99,649.50
4. Step 4: Simplify right side
   64,488.75x = 9,930,022,850.25
5. Step 5: Solve for x
   x = 9,930,022,850.25/64,488.75
6. Step 6: Final answer
   x = 153,980.70