Finding the Fourth Proportional to 11,817.72, 17,722.68 and 3,918.42

Step by Step Solution

1. Step 1: Write the proportion equation
   11,817.72 : 17,722.68 = 3,918.42 : x
2. Step 2: Convert to fraction form
   11,817.72/17,722.68 = 3,918.42/x
3. Step 3: Cross multiply
   11,817.72x = 17,722.68 × 3,918.42
4. Step 4: Simplify right side
   11,817.72x = 69,444,903.77
5. Step 5: Solve for x
   x = 69,444,903.77/11,817.72
6. Step 6: Final answer
   x = 5,876.34