Finding the Fourth Proportional to 56,429.67, 84,789.81 and 42,520.86

Step by Step Solution

1. Step 1: Write the proportion equation
   56,429.67 : 84,789.81 = 42,520.86 : x
2. Step 2: Convert to fraction form
   56,429.67/84,789.81 = 42,520.86/x
3. Step 3: Cross multiply
   56,429.67x = 84,789.81 × 42,520.86
4. Step 4: Simplify right side
   56,429.67x = 3,605,335,640.44
5. Step 5: Solve for x
   x = 3,605,335,640.44/56,429.67
6. Step 6: Final answer
   x = 63,890.78