Finding the Fourth Proportional to 229,664.72, 316,910.28 and 129,056.72

Step by Step Solution

1. Step 1: Write the proportion equation
   229,664.72 : 316,910.28 = 129,056.72 : x
2. Step 2: Convert to fraction form
   229,664.72/316,910.28 = 129,056.72/x
3. Step 3: Cross multiply
   229,664.72x = 316,910.28 × 129,056.72
4. Step 4: Simplify right side
   229,664.72x = 40,899,401,271.08
5. Step 5: Solve for x
   x = 40,899,401,271.08/229,664.72
6. Step 6: Final answer
   x = 178,083.08