Finding the Fourth Proportional to 20,886.10, 31,333.25 and 9,199.31

Step by Step Solution

1. Step 1: Write the proportion equation
   20,886.10 : 31,333.25 = 9,199.31 : x
2. Step 2: Convert to fraction form
   20,886.10/31,333.25 = 9,199.31/x
3. Step 3: Cross multiply
   20,886.10x = 31,333.25 × 9,199.31
4. Step 4: Simplify right side
   20,886.10x = 288,244,312.39
5. Step 5: Solve for x
   x = 288,244,312.39/20,886.10
6. Step 6: Final answer
   x = 13,800.77