Finding the Third Proportional to 87,379 and 189,040

Step by Step Solution

1. Step 1: Write the proportion equation
   87,379 : 189,040 = 189,040 : x
2. Step 2: Convert to fraction form
   87,379/189,040 = 189,040/x
3. Step 3: Cross multiply
   87,379x = 189,040 × 189,040
4. Step 4: Simplify right side
   87,379x = 35,736,121,600
5. Step 5: Solve for x
   x = 35,736,121,600/87,379
6. Step 6: Final answer
   x = 408,978.38