Finding the Third Proportional to 31,542.78 and 69,486.37

Step by Step Solution

1. Step 1: Write the proportion equation
   31,542.78 : 69,486.37 = 69,486.37 : x
2. Step 2: Convert to fraction form
   31,542.78/69,486.37 = 69,486.37/x
3. Step 3: Cross multiply
   31,542.78x = 69,486.37 × 69,486.37
4. Step 4: Simplify right side
   31,542.78x = 4,828,355,903.49
5. Step 5: Solve for x
   x = 4,828,355,903.49/31,542.78
6. Step 6: Final answer
   x = 153,073.27