Finding the Fourth Proportional to 428,663.46, 642,932.01 and 113,142.54

Step by Step Solution

1. Step 1: Write the proportion equation
   428,663.46 : 642,932.01 = 113,142.54 : x
2. Step 2: Convert to fraction form
   428,663.46/642,932.01 = 113,142.54/x
3. Step 3: Cross multiply
   428,663.46x = 642,932.01 × 113,142.54
4. Step 4: Simplify right side
   428,663.46x = 72,742,960,658.71
5. Step 5: Solve for x
   x = 72,742,960,658.71/428,663.46
6. Step 6: Final answer
   x = 169,697.13