Finding the Fourth Proportional to 13,613.15, 18,784.74 and 7,644.77

Step by Step Solution

1. Step 1: Write the proportion equation
   13,613.15 : 18,784.74 = 7,644.77 : x
2. Step 2: Convert to fraction form
   13,613.15/18,784.74 = 7,644.77/x
3. Step 3: Cross multiply
   13,613.15x = 18,784.74 × 7,644.77
4. Step 4: Simplify right side
   13,613.15x = 143,604,922.89
5. Step 5: Solve for x
   x = 143,604,922.89/13,613.15
6. Step 6: Final answer
   x = 10,548.99