Finding the Third Proportional to 86,388 and 130,920

Step by Step Solution

1. Step 1: Write the proportion equation
   86,388 : 130,920 = 130,920 : x
2. Step 2: Convert to fraction form
   86,388/130,920 = 130,920/x
3. Step 3: Cross multiply
   86,388x = 130,920 × 130,920
4. Step 4: Simplify right side
   86,388x = 17,140,046,400
5. Step 5: Solve for x
   x = 17,140,046,400/86,388
6. Step 6: Final answer
   x = 198,407.72