Finding the Fourth Proportional to 315,666.72, 435,603.42 and 172,424.70

Step by Step Solution

1. Step 1: Write the proportion equation
   315,666.72 : 435,603.42 = 172,424.70 : x
2. Step 2: Convert to fraction form
   315,666.72/435,603.42 = 172,424.70/x
3. Step 3: Cross multiply
   315,666.72x = 435,603.42 × 172,424.70
4. Step 4: Simplify right side
   315,666.72x = 75,108,789,012.47
5. Step 5: Solve for x
   x = 75,108,789,012.47/315,666.72
6. Step 6: Final answer
   x = 237,936.99