Finding the Third Proportional to 55,439.53 and 86,868.19

Step by Step Solution

1. Step 1: Write the proportion equation
   55,439.53 : 86,868.19 = 86,868.19 : x
2. Step 2: Convert to fraction form
   55,439.53/86,868.19 = 86,868.19/x
3. Step 3: Cross multiply
   55,439.53x = 86,868.19 × 86,868.19
4. Step 4: Simplify right side
   55,439.53x = 7,546,081,999.54
5. Step 5: Solve for x
   x = 7,546,081,999.54/55,439.53
6. Step 6: Final answer
   x = 136,113.74