Finding the Fourth Proportional to 638,109.51, 880,609.98 and 351,648.15

Step by Step Solution

1. Step 1: Write the proportion equation
   638,109.51 : 880,609.98 = 351,648.15 : x
2. Step 2: Convert to fraction form
   638,109.51/880,609.98 = 351,648.15/x
3. Step 3: Cross multiply
   638,109.51x = 880,609.98 × 351,648.15
4. Step 4: Simplify right side
   638,109.51x = 309,664,870,338.54
5. Step 5: Solve for x
   x = 309,664,870,338.54/638,109.51
6. Step 6: Final answer
   x = 485,284.84