Finding the Fourth Proportional to 637,978.78, 880,410.24 and 351,498.88

Step by Step Solution

1. Step 1: Write the proportion equation
   637,978.78 : 880,410.24 = 351,498.88 : x
2. Step 2: Convert to fraction form
   637,978.78/880,410.24 = 351,498.88/x
3. Step 3: Cross multiply
   637,978.78x = 880,410.24 × 351,498.88
4. Step 4: Simplify right side
   637,978.78x = 309,463,213,300.53
5. Step 5: Solve for x
   x = 309,463,213,300.53/637,978.78
6. Step 6: Final answer
   x = 485,068.19