Finding the Third Proportional to 643,185 and 945,507.50

Step by Step Solution

1. Step 1: Write the proportion equation
   643,185 : 945,507.50 = 945,507.50 : x
2. Step 2: Convert to fraction form
   643,185/945,507.50 = 945,507.50/x
3. Step 3: Cross multiply
   643,185x = 945,507.50 × 945,507.50
4. Step 4: Simplify right side
   643,185x = 893,984,432,556.25
5. Step 5: Solve for x
   x = 893,984,432,556.25/643,185
6. Step 6: Final answer
   x = 1,389,933.58