Finding the Third Proportional to 55,729.50 and 86,389

Step by Step Solution

1. Step 1: Write the proportion equation
   55,729.50 : 86,389 = 86,389 : x
2. Step 2: Convert to fraction form
   55,729.50/86,389 = 86,389/x
3. Step 3: Cross multiply
   55,729.50x = 86,389 × 86,389
4. Step 4: Simplify right side
   55,729.50x = 7,463,059,321
5. Step 5: Solve for x
   x = 7,463,059,321/55,729.50
6. Step 6: Final answer
   x = 133,915.78