Finding the Third Proportional to 42,156 and 56,388

Step by Step Solution

1. Step 1: Write the proportion equation
   42,156 : 56,388 = 56,388 : x
2. Step 2: Convert to fraction form
   42,156/56,388 = 56,388/x
3. Step 3: Cross multiply
   42,156x = 56,388 × 56,388
4. Step 4: Simplify right side
   42,156x = 3,179,606,544
5. Step 5: Solve for x
   x = 3,179,606,544/42,156
6. Step 6: Final answer
   x = 75,424.77