Finding the Fourth Proportional to 9,111.34, 13,663.18 and 3,186.96

Step by Step Solution

1. Step 1: Write the proportion equation
   9,111.34 : 13,663.18 = 3,186.96 : x
2. Step 2: Convert to fraction form
   9,111.34/13,663.18 = 3,186.96/x
3. Step 3: Cross multiply
   9,111.34x = 13,663.18 × 3,186.96
4. Step 4: Simplify right side
   9,111.34x = 43,544,008.13
5. Step 5: Solve for x
   x = 43,544,008.13/9,111.34
6. Step 6: Final answer
   x = 4,779.10