Finding the Fourth Proportional to 287,457.78, 431,269.89 and 118,947

Step by Step Solution

1. Step 1: Write the proportion equation
   287,457.78 : 431,269.89 = 118,947 : x
2. Step 2: Convert to fraction form
   287,457.78/431,269.89 = 118,947/x
3. Step 3: Cross multiply
   287,457.78x = 431,269.89 × 118,947
4. Step 4: Simplify right side
   287,457.78x = 51,298,259,605.83
5. Step 5: Solve for x
   x = 51,298,259,605.83/287,457.78
6. Step 6: Final answer
   x = 178,454.94