Finding the Fourth Proportional to 13,868.83, 19,139 and 7,581.21

Step by Step Solution

1. Step 1: Write the proportion equation
   13,868.83 : 19,139 = 7,581.21 : x
2. Step 2: Convert to fraction form
   13,868.83/19,139 = 7,581.21/x
3. Step 3: Cross multiply
   13,868.83x = 19,139 × 7,581.21
4. Step 4: Simplify right side
   13,868.83x = 145,096,778.19
5. Step 5: Solve for x
   x = 145,096,778.19/13,868.83
6. Step 6: Final answer
   x = 10,462.08