Finding the Fourth Proportional to 638,019.72, 880,455.78 and 351,566.28

Step by Step Solution

1. Step 1: Write the proportion equation
   638,019.72 : 880,455.78 = 351,566.28 : x
2. Step 2: Convert to fraction form
   638,019.72/880,455.78 = 351,566.28/x
3. Step 3: Cross multiply
   638,019.72x = 880,455.78 × 351,566.28
4. Step 4: Simplify right side
   638,019.72x = 309,538,563,279.10
5. Step 5: Solve for x
   x = 309,538,563,279.10/638,019.72
6. Step 6: Final answer
   x = 485,155.17