Finding the Fourth Proportional to 236,540.72, 326,420.96 and 129,112.52

Step by Step Solution

1. Step 1: Write the proportion equation
   236,540.72 : 326,420.96 = 129,112.52 : x
2. Step 2: Convert to fraction form
   236,540.72/326,420.96 = 129,112.52/x
3. Step 3: Cross multiply
   236,540.72x = 326,420.96 × 129,112.52
4. Step 4: Simplify right side
   236,540.72x = 42,145,032,726.42
5. Step 5: Solve for x
   x = 42,145,032,726.42/236,540.72
6. Step 6: Final answer
   x = 178,172.42