Finding the Fourth Proportional to 20,581.34, 30,887.35 and 13,902.03

Step by Step Solution

1. Step 1: Write the proportion equation
   20,581.34 : 30,887.35 = 13,902.03 : x
2. Step 2: Convert to fraction form
   20,581.34/30,887.35 = 13,902.03/x
3. Step 3: Cross multiply
   20,581.34x = 30,887.35 × 13,902.03
4. Step 4: Simplify right side
   20,581.34x = 429,396,866.32
5. Step 5: Solve for x
   x = 429,396,866.32/20,581.34
6. Step 6: Final answer
   x = 20,863.41