Finding the Fourth Proportional to 21,038.50, 31,557.99 and 5,455.18

Step by Step Solution

1. Step 1: Write the proportion equation
   21,038.50 : 31,557.99 = 5,455.18 : x
2. Step 2: Convert to fraction form
   21,038.50/31,557.99 = 5,455.18/x
3. Step 3: Cross multiply
   21,038.50x = 31,557.99 × 5,455.18
4. Step 4: Simplify right side
   21,038.50x = 172,154,515.89
5. Step 5: Solve for x
   x = 172,154,515.89/21,038.50
6. Step 6: Final answer
   x = 8,182.83