Finding the Third Proportional to 40,139 and 87,890

Step by Step Solution

1. Step 1: Write the proportion equation
   40,139 : 87,890 = 87,890 : x
2. Step 2: Convert to fraction form
   40,139/87,890 = 87,890/x
3. Step 3: Cross multiply
   40,139x = 87,890 × 87,890
4. Step 4: Simplify right side
   40,139x = 7,724,652,100
5. Step 5: Solve for x
   x = 7,724,652,100/40,139
6. Step 6: Final answer
   x = 192,447.55