Finding the Fourth Proportional to 12,843.64, 17,699.34 and 9,111.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,843.64 : 17,699.34 = 9,111.16 : x
2. Step 2: Convert to fraction form
   12,843.64/17,699.34 = 9,111.16/x
3. Step 3: Cross multiply
   12,843.64x = 17,699.34 × 9,111.16
4. Step 4: Simplify right side
   12,843.64x = 161,261,518.63
5. Step 5: Solve for x
   x = 161,261,518.63/12,843.64
6. Step 6: Final answer
   x = 12,555.75