Finding the Third Proportional to 55,239 and 86,411.25

Step by Step Solution

1. Step 1: Write the proportion equation
   55,239 : 86,411.25 = 86,411.25 : x
2. Step 2: Convert to fraction form
   55,239/86,411.25 = 86,411.25/x
3. Step 3: Cross multiply
   55,239x = 86,411.25 × 86,411.25
4. Step 4: Simplify right side
   55,239x = 7,466,904,126.56
5. Step 5: Solve for x
   x = 7,466,904,126.56/55,239
6. Step 6: Final answer
   x = 135,174.50