Finding the Fourth Proportional to 13,856.31, 19,121.90 and 7,568.69

Step by Step Solution

1. Step 1: Write the proportion equation
   13,856.31 : 19,121.90 = 7,568.69 : x
2. Step 2: Convert to fraction form
   13,856.31/19,121.90 = 7,568.69/x
3. Step 3: Cross multiply
   13,856.31x = 19,121.90 × 7,568.69
4. Step 4: Simplify right side
   13,856.31x = 144,727,599.86
5. Step 5: Solve for x
   x = 144,727,599.86/13,856.31
6. Step 6: Final answer
   x = 10,444.89