Finding the Fourth Proportional to 11,189.72, 16,781.00 and 3,691.60

Step by Step Solution

1. Step 1: Write the proportion equation
   11,189.72 : 16,781.00 = 3,691.60 : x
2. Step 2: Convert to fraction form
   11,189.72/16,781.00 = 3,691.60/x
3. Step 3: Cross multiply
   11,189.72x = 16,781.00 × 3,691.60
4. Step 4: Simplify right side
   11,189.72x = 61,948,679.19
5. Step 5: Solve for x
   x = 61,948,679.19/11,189.72
6. Step 6: Final answer
   x = 5,536.21