Finding the Fourth Proportional to 13,781.05, 19,016.27 and 7,811.53

Step by Step Solution

1. Step 1: Write the proportion equation
   13,781.05 : 19,016.27 = 7,811.53 : x
2. Step 2: Convert to fraction form
   13,781.05/19,016.27 = 7,811.53/x
3. Step 3: Cross multiply
   13,781.05x = 19,016.27 × 7,811.53
4. Step 4: Simplify right side
   13,781.05x = 148,546,124.54
5. Step 5: Solve for x
   x = 148,546,124.54/13,781.05
6. Step 6: Final answer
   x = 10,779.01