Finding the Third Proportional to 42,120 and 56,520

Step by Step Solution

1. Step 1: Write the proportion equation
   42,120 : 56,520 = 56,520 : x
2. Step 2: Convert to fraction form
   42,120/56,520 = 56,520/x
3. Step 3: Cross multiply
   42,120x = 56,520 × 56,520
4. Step 4: Simplify right side
   42,120x = 3,194,510,400
5. Step 5: Solve for x
   x = 3,194,510,400/42,120
6. Step 6: Final answer
   x = 75,843.08