Finding the Fourth Proportional to 56,171.85, 77,517.77 and 30,678.96

Step by Step Solution

1. Step 1: Write the proportion equation
   56,171.85 : 77,517.77 = 30,678.96 : x
2. Step 2: Convert to fraction form
   56,171.85/77,517.77 = 30,678.96/x
3. Step 3: Cross multiply
   56,171.85x = 77,517.77 × 30,678.96
4. Step 4: Simplify right side
   56,171.85x = 2,378,164,411.72
5. Step 5: Solve for x
   x = 2,378,164,411.72/56,171.85
6. Step 6: Final answer
   x = 42,337.30