Finding the Fourth Proportional to 879,443.86, 1,213,530.37 and 492,280.87

Step by Step Solution

1. Step 1: Write the proportion equation
   879,443.86 : 1,213,530.37 = 492,280.87 : x
2. Step 2: Convert to fraction form
   879,443.86/1,213,530.37 = 492,280.87/x
3. Step 3: Cross multiply
   879,443.86x = 1,213,530.37 × 492,280.87
4. Step 4: Simplify right side
   879,443.86x = 597,397,786,315.02
5. Step 5: Solve for x
   x = 597,397,786,315.02/879,443.86
6. Step 6: Final answer
   x = 679,290.42