Finding the Fourth Proportional to 644,105.31, 888,848.42 and 357,618.03

Step by Step Solution

1. Step 1: Write the proportion equation
   644,105.31 : 888,848.42 = 357,618.03 : x
2. Step 2: Convert to fraction form
   644,105.31/888,848.42 = 357,618.03/x
3. Step 3: Cross multiply
   644,105.31x = 888,848.42 × 357,618.03
4. Step 4: Simplify right side
   644,105.31x = 317,868,219,140.92
5. Step 5: Solve for x
   x = 317,868,219,140.92/644,105.31
6. Step 6: Final answer
   x = 493,503.49