Finding the Third Proportional to 30,276.28 and 72,478.55

Step by Step Solution

1. Step 1: Write the proportion equation
   30,276.28 : 72,478.55 = 72,478.55 : x
2. Step 2: Convert to fraction form
   30,276.28/72,478.55 = 72,478.55/x
3. Step 3: Cross multiply
   30,276.28x = 72,478.55 × 72,478.55
4. Step 4: Simplify right side
   30,276.28x = 5,253,139,757.11
5. Step 5: Solve for x
   x = 5,253,139,757.11/30,276.28
6. Step 6: Final answer
   x = 173,506.77