Finding the Fourth Proportional to 56,870.58, 78,481.56 and 31,721.70

Step by Step Solution

1. Step 1: Write the proportion equation
   56,870.58 : 78,481.56 = 31,721.70 : x
2. Step 2: Convert to fraction form
   56,870.58/78,481.56 = 31,721.70/x
3. Step 3: Cross multiply
   56,870.58x = 78,481.56 × 31,721.70
4. Step 4: Simplify right side
   56,870.58x = 2,489,568,501.85
5. Step 5: Solve for x
   x = 2,489,568,501.85/56,870.58
6. Step 6: Final answer
   x = 43,776.04