Finding the Fourth Proportional to 38,871, 58,300.20 and 13,906.35

Step by Step Solution

1. Step 1: Write the proportion equation
   38,871 : 58,300.20 = 13,906.35 : x
2. Step 2: Convert to fraction form
   38,871/58,300.20 = 13,906.35/x
3. Step 3: Cross multiply
   38,871x = 58,300.20 × 13,906.35
4. Step 4: Simplify right side
   38,871x = 810,742,986.27
5. Step 5: Solve for x
   x = 810,742,986.27/38,871
6. Step 6: Final answer
   x = 20,857.27