Finding the Fourth Proportional to 287,383.16, 431,074.72 and 87,704.56

Step by Step Solution

1. Step 1: Write the proportion equation
   287,383.16 : 431,074.72 = 87,704.56 : x
2. Step 2: Convert to fraction form
   287,383.16/431,074.72 = 87,704.56/x
3. Step 3: Cross multiply
   287,383.16x = 431,074.72 × 87,704.56
4. Step 4: Simplify right side
   287,383.16x = 37,807,218,644.72
5. Step 5: Solve for x
   x = 37,807,218,644.72/287,383.16
6. Step 6: Final answer
   x = 131,556.83