Finding the Fourth Proportional to 56,086.72, 77,396.16 and 30,936.16

Step by Step Solution

1. Step 1: Write the proportion equation
   56,086.72 : 77,396.16 = 30,936.16 : x
2. Step 2: Convert to fraction form
   56,086.72/77,396.16 = 30,936.16/x
3. Step 3: Cross multiply
   56,086.72x = 77,396.16 × 30,936.16
4. Step 4: Simplify right side
   56,086.72x = 2,394,339,989.15
5. Step 5: Solve for x
   x = 2,394,339,989.15/56,086.72
6. Step 6: Final answer
   x = 42,689.96