Finding the Third Proportional to 64,543.50 and 99,697.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,543.50 : 99,697.50 = 99,697.50 : x
2. Step 2: Convert to fraction form
   64,543.50/99,697.50 = 99,697.50/x
3. Step 3: Cross multiply
   64,543.50x = 99,697.50 × 99,697.50
4. Step 4: Simplify right side
   64,543.50x = 9,939,591,506.25
5. Step 5: Solve for x
   x = 9,939,591,506.25/64,543.50
6. Step 6: Final answer
   x = 153,998.33