Finding the Fourth Proportional to 57,185.58, 78,908.62 and 31,690.72

Step by Step Solution

1. Step 1: Write the proportion equation
   57,185.58 : 78,908.62 = 31,690.72 : x
2. Step 2: Convert to fraction form
   57,185.58/78,908.62 = 31,690.72/x
3. Step 3: Cross multiply
   57,185.58x = 78,908.62 × 31,690.72
4. Step 4: Simplify right side
   57,185.58x = 2,500,670,429.01
5. Step 5: Solve for x
   x = 2,500,670,429.01/57,185.58
6. Step 6: Final answer
   x = 43,729.04