Finding the Fourth Proportional to 638,123.69, 880,653.38 and 351,643.83

Step by Step Solution

1. Step 1: Write the proportion equation
   638,123.69 : 880,653.38 = 351,643.83 : x
2. Step 2: Convert to fraction form
   638,123.69/880,653.38 = 351,643.83/x
3. Step 3: Cross multiply
   638,123.69x = 880,653.38 × 351,643.83
4. Step 4: Simplify right side
   638,123.69x = 309,676,325,687.43
5. Step 5: Solve for x
   x = 309,676,325,687.43/638,123.69
6. Step 6: Final answer
   x = 485,292.01