Finding the Fourth Proportional to 13,909.29, 19,194.89 and 7,621.71

Step by Step Solution

1. Step 1: Write the proportion equation
   13,909.29 : 19,194.89 = 7,621.71 : x
2. Step 2: Convert to fraction form
   13,909.29/19,194.89 = 7,621.71/x
3. Step 3: Cross multiply
   13,909.29x = 19,194.89 × 7,621.71
4. Step 4: Simplify right side
   13,909.29x = 146,297,846.95
5. Step 5: Solve for x
   x = 146,297,846.95/13,909.29
6. Step 6: Final answer
   x = 10,518.00