Finding the Fourth Proportional to 28,111.24, 42,174.15 and 8,389.36

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.24 : 42,174.15 = 8,389.36 : x
2. Step 2: Convert to fraction form
   28,111.24/42,174.15 = 8,389.36/x
3. Step 3: Cross multiply
   28,111.24x = 42,174.15 × 8,389.36
4. Step 4: Simplify right side
   28,111.24x = 353,814,127.04
5. Step 5: Solve for x
   x = 353,814,127.04/28,111.24
6. Step 6: Final answer
   x = 12,586.22