Finding the Third Proportional to 40,172 and 87,490

Step by Step Solution

1. Step 1: Write the proportion equation
   40,172 : 87,490 = 87,490 : x
2. Step 2: Convert to fraction form
   40,172/87,490 = 87,490/x
3. Step 3: Cross multiply
   40,172x = 87,490 × 87,490
4. Step 4: Simplify right side
   40,172x = 7,654,500,100
5. Step 5: Solve for x
   x = 7,654,500,100/40,172
6. Step 6: Final answer
   x = 190,543.17