Finding the Fourth Proportional to 56,142.46, 77,476.41 and 30,991.78

Step by Step Solution

1. Step 1: Write the proportion equation
   56,142.46 : 77,476.41 = 30,991.78 : x
2. Step 2: Convert to fraction form
   56,142.46/77,476.41 = 30,991.78/x
3. Step 3: Cross multiply
   56,142.46x = 77,476.41 × 30,991.78
4. Step 4: Simplify right side
   56,142.46x = 2,401,131,853.91
5. Step 5: Solve for x
   x = 2,401,131,853.91/56,142.46
6. Step 6: Final answer
   x = 42,768.55