Finding the Fourth Proportional to 428,150.88, 642,425.58 and 191,653.56

Step by Step Solution

1. Step 1: Write the proportion equation
   428,150.88 : 642,425.58 = 191,653.56 : x
2. Step 2: Convert to fraction form
   428,150.88/642,425.58 = 191,653.56/x
3. Step 3: Cross multiply
   428,150.88x = 642,425.58 × 191,653.56
4. Step 4: Simplify right side
   428,150.88x = 123,123,149,442.07
5. Step 5: Solve for x
   x = 123,123,149,442.07/428,150.88
6. Step 6: Final answer
   x = 287,569.53