Finding the Third Proportional to 30,143.39 and 64,438.45

Step by Step Solution

1. Step 1: Write the proportion equation
   30,143.39 : 64,438.45 = 64,438.45 : x
2. Step 2: Convert to fraction form
   30,143.39/64,438.45 = 64,438.45/x
3. Step 3: Cross multiply
   30,143.39x = 64,438.45 × 64,438.45
4. Step 4: Simplify right side
   30,143.39x = 4,152,314,241.14
5. Step 5: Solve for x
   x = 4,152,314,241.14/30,143.39
6. Step 6: Final answer
   x = 137,752.06