Finding the Third Proportional to 18,912 and 41,139

Step by Step Solution

1. Step 1: Write the proportion equation
   18,912 : 41,139 = 41,139 : x
2. Step 2: Convert to fraction form
   18,912/41,139 = 41,139/x
3. Step 3: Cross multiply
   18,912x = 41,139 × 41,139
4. Step 4: Simplify right side
   18,912x = 1,692,417,321
5. Step 5: Solve for x
   x = 1,692,417,321/18,912
6. Step 6: Final answer
   x = 89,489.07