Finding the Fourth Proportional to 56,142.38, 77,476.50 and 30,991.88

Step by Step Solution

1. Step 1: Write the proportion equation
   56,142.38 : 77,476.50 = 30,991.88 : x
2. Step 2: Convert to fraction form
   56,142.38/77,476.50 = 30,991.88/x
3. Step 3: Cross multiply
   56,142.38x = 77,476.50 × 30,991.88
4. Step 4: Simplify right side
   56,142.38x = 2,401,142,003.44
5. Step 5: Solve for x
   x = 2,401,142,003.44/56,142.38
6. Step 6: Final answer
   x = 42,768.80