Finding the Fourth Proportional to 12,902.72, 17,809.53 and 8,427.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,902.72 : 17,809.53 = 8,427.16 : x
2. Step 2: Convert to fraction form
   12,902.72/17,809.53 = 8,427.16/x
3. Step 3: Cross multiply
   12,902.72x = 17,809.53 × 8,427.16
4. Step 4: Simplify right side
   12,902.72x = 150,083,716.70
5. Step 5: Solve for x
   x = 150,083,716.70/12,902.72
6. Step 6: Final answer
   x = 11,631.95