Finding the Third Proportional to 72,978 and 157,620

Step by Step Solution

1. Step 1: Write the proportion equation
   72,978 : 157,620 = 157,620 : x
2. Step 2: Convert to fraction form
   72,978/157,620 = 157,620/x
3. Step 3: Cross multiply
   72,978x = 157,620 × 157,620
4. Step 4: Simplify right side
   72,978x = 24,844,064,400
5. Step 5: Solve for x
   x = 24,844,064,400/72,978
6. Step 6: Final answer
   x = 340,432.25