Finding the Fourth Proportional to 13,709.90, 18,919.68 and 7,422.27

Step by Step Solution

1. Step 1: Write the proportion equation
   13,709.90 : 18,919.68 = 7,422.27 : x
2. Step 2: Convert to fraction form
   13,709.90/18,919.68 = 7,422.27/x
3. Step 3: Cross multiply
   13,709.90x = 18,919.68 × 7,422.27
4. Step 4: Simplify right side
   13,709.90x = 140,426,973.27
5. Step 5: Solve for x
   x = 140,426,973.27/13,709.90
6. Step 6: Final answer
   x = 10,242.75