Finding the Fourth Proportional to 309,762.72, 427,603.04 and 209,296.80

Step by Step Solution

1. Step 1: Write the proportion equation
   309,762.72 : 427,603.04 = 209,296.80 : x
2. Step 2: Convert to fraction form
   309,762.72/427,603.04 = 209,296.80/x
3. Step 3: Cross multiply
   309,762.72x = 427,603.04 × 209,296.80
4. Step 4: Simplify right side
   309,762.72x = 89,495,947,942.27
5. Step 5: Solve for x
   x = 89,495,947,942.27/309,762.72
6. Step 6: Final answer
   x = 288,917.75