Finding the Third Proportional to 64,485 and 99,643.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,485 : 99,643.50 = 99,643.50 : x
2. Step 2: Convert to fraction form
   64,485/99,643.50 = 99,643.50/x
3. Step 3: Cross multiply
   64,485x = 99,643.50 × 99,643.50
4. Step 4: Simplify right side
   64,485x = 9,928,827,092.25
5. Step 5: Solve for x
   x = 9,928,827,092.25/64,485
6. Step 6: Final answer
   x = 153,971.11