Finding the Fourth Proportional to 426,150.72, 639,375.12 and 189,470.88

Step by Step Solution

1. Step 1: Write the proportion equation
   426,150.72 : 639,375.12 = 189,470.88 : x
2. Step 2: Convert to fraction form
   426,150.72/639,375.12 = 189,470.88/x
3. Step 3: Cross multiply
   426,150.72x = 639,375.12 × 189,470.88
4. Step 4: Simplify right side
   426,150.72x = 121,142,966,636.51
5. Step 5: Solve for x
   x = 121,142,966,636.51/426,150.72
6. Step 6: Final answer
   x = 284,272.58