Finding the Fourth Proportional to 792,111.30, 1,188,750.15 and 319,136.10

Step by Step Solution

1. Step 1: Write the proportion equation
   792,111.30 : 1,188,750.15 = 319,136.10 : x
2. Step 2: Convert to fraction form
   792,111.30/1,188,750.15 = 319,136.10/x
3. Step 3: Cross multiply
   792,111.30x = 1,188,750.15 × 319,136.10
4. Step 4: Simplify right side
   792,111.30x = 379,373,086,745.42
5. Step 5: Solve for x
   x = 379,373,086,745.42/792,111.30
6. Step 6: Final answer
   x = 478,939.12