Finding the Third Proportional to 54,378.84 and 84,028.64

Step by Step Solution

1. Step 1: Write the proportion equation
   54,378.84 : 84,028.64 = 84,028.64 : x
2. Step 2: Convert to fraction form
   54,378.84/84,028.64 = 84,028.64/x
3. Step 3: Cross multiply
   54,378.84x = 84,028.64 × 84,028.64
4. Step 4: Simplify right side
   54,378.84x = 7,060,812,445.29
5. Step 5: Solve for x
   x = 7,060,812,445.29/54,378.84
6. Step 6: Final answer
   x = 129,844.84