Finding the Fourth Proportional to 57,878, 86,785.72 and 31,238.32

Step by Step Solution

1. Step 1: Write the proportion equation
   57,878 : 86,785.72 = 31,238.32 : x
2. Step 2: Convert to fraction form
   57,878/86,785.72 = 31,238.32/x
3. Step 3: Cross multiply
   57,878x = 86,785.72 × 31,238.32
4. Step 4: Simplify right side
   57,878x = 2,711,040,092.79
5. Step 5: Solve for x
   x = 2,711,040,092.79/57,878
6. Step 6: Final answer
   x = 46,840.60