Finding the Third Proportional to 128,974 and 172,012.50

Step by Step Solution

1. Step 1: Write the proportion equation
   128,974 : 172,012.50 = 172,012.50 : x
2. Step 2: Convert to fraction form
   128,974/172,012.50 = 172,012.50/x
3. Step 3: Cross multiply
   128,974x = 172,012.50 × 172,012.50
4. Step 4: Simplify right side
   128,974x = 29,588,300,156.25
5. Step 5: Solve for x
   x = 29,588,300,156.25/128,974
6. Step 6: Final answer
   x = 229,412.91