Finding the Third Proportional to 42,354 and 56,619

Step by Step Solution

1. Step 1: Write the proportion equation
   42,354 : 56,619 = 56,619 : x
2. Step 2: Convert to fraction form
   42,354/56,619 = 56,619/x
3. Step 3: Cross multiply
   42,354x = 56,619 × 56,619
4. Step 4: Simplify right side
   42,354x = 3,205,711,161
5. Step 5: Solve for x
   x = 3,205,711,161/42,354
6. Step 6: Final answer
   x = 75,688.51