Finding the Fourth Proportional to 13,781.59, 19,018.55 and 8,404.03

Step by Step Solution

1. Step 1: Write the proportion equation
   13,781.59 : 19,018.55 = 8,404.03 : x
2. Step 2: Convert to fraction form
   13,781.59/19,018.55 = 8,404.03/x
3. Step 3: Cross multiply
   13,781.59x = 19,018.55 × 8,404.03
4. Step 4: Simplify right side
   13,781.59x = 159,832,327.64
5. Step 5: Solve for x
   x = 159,832,327.64/13,781.59
6. Step 6: Final answer
   x = 11,597.53