Finding the Third Proportional to 54,411.75 and 84,078

Step by Step Solution

1. Step 1: Write the proportion equation
   54,411.75 : 84,078 = 84,078 : x
2. Step 2: Convert to fraction form
   54,411.75/84,078 = 84,078/x
3. Step 3: Cross multiply
   54,411.75x = 84,078 × 84,078
4. Step 4: Simplify right side
   54,411.75x = 7,069,110,084
5. Step 5: Solve for x
   x = 7,069,110,084/54,411.75
6. Step 6: Final answer
   x = 129,918.82