Finding the Fourth Proportional to 238,401.41, 328,997.43 and 129,507.78

Step by Step Solution

1. Step 1: Write the proportion equation
   238,401.41 : 328,997.43 = 129,507.78 : x
2. Step 2: Convert to fraction form
   238,401.41/328,997.43 = 129,507.78/x
3. Step 3: Cross multiply
   238,401.41x = 328,997.43 × 129,507.78
4. Step 4: Simplify right side
   238,401.41x = 42,607,726,785.01
5. Step 5: Solve for x
   x = 42,607,726,785.01/238,401.41
6. Step 6: Final answer
   x = 178,722.63