Finding the Third Proportional to 17,906 and 42,120

Step by Step Solution

1. Step 1: Write the proportion equation
   17,906 : 42,120 = 42,120 : x
2. Step 2: Convert to fraction form
   17,906/42,120 = 42,120/x
3. Step 3: Cross multiply
   17,906x = 42,120 × 42,120
4. Step 4: Simplify right side
   17,906x = 1,774,094,400
5. Step 5: Solve for x
   x = 1,774,094,400/17,906
6. Step 6: Final answer
   x = 99,078.21