Finding the Fourth Proportional to 13,478.71, 18,590.72 and 8,933.17

Step by Step Solution

1. Step 1: Write the proportion equation
   13,478.71 : 18,590.72 = 8,933.17 : x
2. Step 2: Convert to fraction form
   13,478.71/18,590.72 = 8,933.17/x
3. Step 3: Cross multiply
   13,478.71x = 18,590.72 × 8,933.17
4. Step 4: Simplify right side
   13,478.71x = 166,073,969.23
5. Step 5: Solve for x
   x = 166,073,969.23/13,478.71
6. Step 6: Final answer
   x = 12,321.21