Finding the Fourth Proportional to 899,196.36, 1,240,876.44 and 491,289.42

Step by Step Solution

1. Step 1: Write the proportion equation
   899,196.36 : 1,240,876.44 = 491,289.42 : x
2. Step 2: Convert to fraction form
   899,196.36/1,240,876.44 = 491,289.42/x
3. Step 3: Cross multiply
   899,196.36x = 1,240,876.44 × 491,289.42
4. Step 4: Simplify right side
   899,196.36x = 609,629,466,499.27
5. Step 5: Solve for x
   x = 609,629,466,499.27/899,196.36
6. Step 6: Final answer
   x = 677,971.46