Finding the Fourth Proportional to 128,828.72, 193,152.55 and 56,747.43

Step by Step Solution

1. Step 1: Write the proportion equation
   128,828.72 : 193,152.55 = 56,747.43 : x
2. Step 2: Convert to fraction form
   128,828.72/193,152.55 = 56,747.43/x
3. Step 3: Cross multiply
   128,828.72x = 193,152.55 × 56,747.43
4. Step 4: Simplify right side
   128,828.72x = 10,960,910,668.58
5. Step 5: Solve for x
   x = 10,960,910,668.58/128,828.72
6. Step 6: Final answer
   x = 85,081.26