Finding the Fourth Proportional to 21,289.42, 31,931.70 and 5,705.83

Step by Step Solution

1. Step 1: Write the proportion equation
   21,289.42 : 31,931.70 = 5,705.83 : x
2. Step 2: Convert to fraction form
   21,289.42/31,931.70 = 5,705.83/x
3. Step 3: Cross multiply
   21,289.42x = 31,931.70 × 5,705.83
4. Step 4: Simplify right side
   21,289.42x = 182,196,851.81
5. Step 5: Solve for x
   x = 182,196,851.81/21,289.42
6. Step 6: Final answer
   x = 8,558.09