Finding the Fourth Proportional to 13,906.86, 19,191.54 and 7,619.28

Step by Step Solution

1. Step 1: Write the proportion equation
   13,906.86 : 19,191.54 = 7,619.28 : x
2. Step 2: Convert to fraction form
   13,906.86/19,191.54 = 7,619.28/x
3. Step 3: Cross multiply
   13,906.86x = 19,191.54 × 7,619.28
4. Step 4: Simplify right side
   13,906.86x = 146,225,716.89
5. Step 5: Solve for x
   x = 146,225,716.89/13,906.86
6. Step 6: Final answer
   x = 10,514.65