Finding the Fourth Proportional to 428,086.42, 642,078.56 and 112,567.93

Step by Step Solution

1. Step 1: Write the proportion equation
   428,086.42 : 642,078.56 = 112,567.93 : x
2. Step 2: Convert to fraction form
   428,086.42/642,078.56 = 112,567.93/x
3. Step 3: Cross multiply
   428,086.42x = 642,078.56 × 112,567.93
4. Step 4: Simplify right side
   428,086.42x = 72,277,453,072.80
5. Step 5: Solve for x
   x = 72,277,453,072.80/428,086.42
6. Step 6: Final answer
   x = 168,838.46