Finding the Fourth Proportional to 8,909.24, 13,368.54 and 5,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,909.24 : 13,368.54 = 5,218.72 : x
2. Step 2: Convert to fraction form
   8,909.24/13,368.54 = 5,218.72/x
3. Step 3: Cross multiply
   8,909.24x = 13,368.54 × 5,218.72
4. Step 4: Simplify right side
   8,909.24x = 69,766,667.07
5. Step 5: Solve for x
   x = 69,766,667.07/8,909.24
6. Step 6: Final answer
   x = 7,830.82