Finding the Third Proportional to 103,990 and 158,172

Step by Step Solution

1. Step 1: Write the proportion equation
   103,990 : 158,172 = 158,172 : x
2. Step 2: Convert to fraction form
   103,990/158,172 = 158,172/x
3. Step 3: Cross multiply
   103,990x = 158,172 × 158,172
4. Step 4: Simplify right side
   103,990x = 25,018,381,584
5. Step 5: Solve for x
   x = 25,018,381,584/103,990
6. Step 6: Final answer
   x = 240,584.49