Finding the Fourth Proportional to 55,791.38, 76,992.71 and 30,640.88

Step by Step Solution

1. Step 1: Write the proportion equation
   55,791.38 : 76,992.71 = 30,640.88 : x
2. Step 2: Convert to fraction form
   55,791.38/76,992.71 = 30,640.88/x
3. Step 3: Cross multiply
   55,791.38x = 76,992.71 × 30,640.88
4. Step 4: Simplify right side
   55,791.38x = 2,359,124,387.98
5. Step 5: Solve for x
   x = 2,359,124,387.98/55,791.38
6. Step 6: Final answer
   x = 42,284.75