Finding the Third Proportional to 42,912 and 56,560

Step by Step Solution

1. Step 1: Write the proportion equation
   42,912 : 56,560 = 56,560 : x
2. Step 2: Convert to fraction form
   42,912/56,560 = 56,560/x
3. Step 3: Cross multiply
   42,912x = 56,560 × 56,560
4. Step 4: Simplify right side
   42,912x = 3,199,033,600
5. Step 5: Solve for x
   x = 3,199,033,600/42,912
6. Step 6: Final answer
   x = 74,548.70