Finding the Third Proportional to 111,189 and 172,428

Step by Step Solution

1. Step 1: Write the proportion equation
   111,189 : 172,428 = 172,428 : x
2. Step 2: Convert to fraction form
   111,189/172,428 = 172,428/x
3. Step 3: Cross multiply
   111,189x = 172,428 × 172,428
4. Step 4: Simplify right side
   111,189x = 29,731,415,184
5. Step 5: Solve for x
   x = 29,731,415,184/111,189
6. Step 6: Final answer
   x = 267,395.29