Finding the Third Proportional to 13,858 and 30,399.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,858 : 30,399.50 = 30,399.50 : x
2. Step 2: Convert to fraction form
   13,858/30,399.50 = 30,399.50/x
3. Step 3: Cross multiply
   13,858x = 30,399.50 × 30,399.50
4. Step 4: Simplify right side
   13,858x = 924,129,600.25
5. Step 5: Solve for x
   x = 924,129,600.25/13,858
6. Step 6: Final answer
   x = 66,685.64