Finding the Fourth Proportional to 285,896.82, 428,842.80 and 72,665.34

Step by Step Solution

1. Step 1: Write the proportion equation
   285,896.82 : 428,842.80 = 72,665.34 : x
2. Step 2: Convert to fraction form
   285,896.82/428,842.80 = 72,665.34/x
3. Step 3: Cross multiply
   285,896.82x = 428,842.80 × 72,665.34
4. Step 4: Simplify right side
   285,896.82x = 31,162,007,868.55
5. Step 5: Solve for x
   x = 31,162,007,868.55/285,896.82
6. Step 6: Final answer
   x = 108,997.39