Finding the Third Proportional to 55,439.50 and 86,868.50

Step by Step Solution

1. Step 1: Write the proportion equation
   55,439.50 : 86,868.50 = 86,868.50 : x
2. Step 2: Convert to fraction form
   55,439.50/86,868.50 = 86,868.50/x
3. Step 3: Cross multiply
   55,439.50x = 86,868.50 × 86,868.50
4. Step 4: Simplify right side
   55,439.50x = 7,546,136,292.25
5. Step 5: Solve for x
   x = 7,546,136,292.25/55,439.50
6. Step 6: Final answer
   x = 136,114.80