Finding the Third Proportional to 42,120 and 90,712

Step by Step Solution

1. Step 1: Write the proportion equation
   42,120 : 90,712 = 90,712 : x
2. Step 2: Convert to fraction form
   42,120/90,712 = 90,712/x
3. Step 3: Cross multiply
   42,120x = 90,712 × 90,712
4. Step 4: Simplify right side
   42,120x = 8,228,666,944
5. Step 5: Solve for x
   x = 8,228,666,944/42,120
6. Step 6: Final answer
   x = 195,362.46