Finding the Fourth Proportional to 238,345.09, 328,918.59 and 129,451.55

Step by Step Solution

1. Step 1: Write the proportion equation
   238,345.09 : 328,918.59 = 129,451.55 : x
2. Step 2: Convert to fraction form
   238,345.09/328,918.59 = 129,451.55/x
3. Step 3: Cross multiply
   238,345.09x = 328,918.59 × 129,451.55
4. Step 4: Simplify right side
   238,345.09x = 42,579,021,504.89
5. Step 5: Solve for x
   x = 42,579,021,504.89/238,345.09
6. Step 6: Final answer
   x = 178,644.43