Finding the Fourth Proportional to 287,654.72, 431,412.87 and 87,976.83

Step by Step Solution

1. Step 1: Write the proportion equation
   287,654.72 : 431,412.87 = 87,976.83 : x
2. Step 2: Convert to fraction form
   287,654.72/431,412.87 = 87,976.83/x
3. Step 3: Cross multiply
   287,654.72x = 431,412.87 × 87,976.83
4. Step 4: Simplify right side
   287,654.72x = 37,954,336,723.80
5. Step 5: Solve for x
   x = 37,954,336,723.80/287,654.72
6. Step 6: Final answer
   x = 131,944.08