Finding the Third Proportional to 42,072 and 56,144

Step by Step Solution

1. Step 1: Write the proportion equation
   42,072 : 56,144 = 56,144 : x
2. Step 2: Convert to fraction form
   42,072/56,144 = 56,144/x
3. Step 3: Cross multiply
   42,072x = 56,144 × 56,144
4. Step 4: Simplify right side
   42,072x = 3,152,148,736
5. Step 5: Solve for x
   x = 3,152,148,736/42,072
6. Step 6: Final answer
   x = 74,922.72