Finding the Fourth Proportional to 13,781.34, 19,020.18 and 9,965.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,781.34 : 19,020.18 = 9,965.37 : x
2. Step 2: Convert to fraction form
   13,781.34/19,020.18 = 9,965.37/x
3. Step 3: Cross multiply
   13,781.34x = 19,020.18 × 9,965.37
4. Step 4: Simplify right side
   13,781.34x = 189,543,131.17
5. Step 5: Solve for x
   x = 189,543,131.17/13,781.34
6. Step 6: Final answer
   x = 13,753.61