Finding the Fourth Proportional to 229,340.72, 316,493.88 and 128,736.56

Step by Step Solution

1. Step 1: Write the proportion equation
   229,340.72 : 316,493.88 = 128,736.56 : x
2. Step 2: Convert to fraction form
   229,340.72/316,493.88 = 128,736.56/x
3. Step 3: Cross multiply
   229,340.72x = 316,493.88 × 128,736.56
4. Step 4: Simplify right side
   229,340.72x = 40,744,333,372.25
5. Step 5: Solve for x
   x = 40,744,333,372.25/229,340.72
6. Step 6: Final answer
   x = 177,658.52