Finding the Fourth Proportional to 172,216.53, 258,171.71 and 67,010.90

Step by Step Solution

1. Step 1: Write the proportion equation
   172,216.53 : 258,171.71 = 67,010.90 : x
2. Step 2: Convert to fraction form
   172,216.53/258,171.71 = 67,010.90/x
3. Step 3: Cross multiply
   172,216.53x = 258,171.71 × 67,010.90
4. Step 4: Simplify right side
   172,216.53x = 17,300,317,015.73
5. Step 5: Solve for x
   x = 17,300,317,015.73/172,216.53
6. Step 6: Final answer
   x = 100,456.77