Finding the Fourth Proportional to 287,942.52, 431,290.56 and 208,882.56

Step by Step Solution

1. Step 1: Write the proportion equation
   287,942.52 : 431,290.56 = 208,882.56 : x
2. Step 2: Convert to fraction form
   287,942.52/431,290.56 = 208,882.56/x
3. Step 3: Cross multiply
   287,942.52x = 431,290.56 × 208,882.56
4. Step 4: Simplify right side
   287,942.52x = 90,089,076,276.63
5. Step 5: Solve for x
   x = 90,089,076,276.63/287,942.52
6. Step 6: Final answer
   x = 312,871.74