Finding the Fourth Proportional to 31,655.78, 47,449.50 and 20,570.42

Step by Step Solution

1. Step 1: Write the proportion equation
   31,655.78 : 47,449.50 = 20,570.42 : x
2. Step 2: Convert to fraction form
   31,655.78/47,449.50 = 20,570.42/x
3. Step 3: Cross multiply
   31,655.78x = 47,449.50 × 20,570.42
4. Step 4: Simplify right side
   31,655.78x = 976,056,185.27
5. Step 5: Solve for x
   x = 976,056,185.27/31,655.78
6. Step 6: Final answer
   x = 30,833.43