Finding the Third Proportional to 27,990 and 42,255

Step by Step Solution

1. Step 1: Write the proportion equation
   27,990 : 42,255 = 42,255 : x
2. Step 2: Convert to fraction form
   27,990/42,255 = 42,255/x
3. Step 3: Cross multiply
   27,990x = 42,255 × 42,255
4. Step 4: Simplify right side
   27,990x = 1,785,485,025
5. Step 5: Solve for x
   x = 1,785,485,025/27,990
6. Step 6: Final answer
   x = 63,790.10