Finding the Fourth Proportional to 28,111.17, 42,174.06 and 8,389.73

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.17 : 42,174.06 = 8,389.73 : x
2. Step 2: Convert to fraction form
   28,111.17/42,174.06 = 8,389.73/x
3. Step 3: Cross multiply
   28,111.17x = 42,174.06 × 8,389.73
4. Step 4: Simplify right side
   28,111.17x = 353,828,971.11
5. Step 5: Solve for x
   x = 353,828,971.11/28,111.17
6. Step 6: Final answer
   x = 12,586.77