Finding the Third Proportional to 13,980 and 30,420.75

Step by Step Solution

1. Step 1: Write the proportion equation
   13,980 : 30,420.75 = 30,420.75 : x
2. Step 2: Convert to fraction form
   13,980/30,420.75 = 30,420.75/x
3. Step 3: Cross multiply
   13,980x = 30,420.75 × 30,420.75
4. Step 4: Simplify right side
   13,980x = 925,422,030.56
5. Step 5: Solve for x
   x = 925,422,030.56/13,980
6. Step 6: Final answer
   x = 66,196.14