Finding the Fourth Proportional to 12,426.93, 18,647.69 and 8,913.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,426.93 : 18,647.69 = 8,913.15 : x
2. Step 2: Convert to fraction form
   12,426.93/18,647.69 = 8,913.15/x
3. Step 3: Cross multiply
   12,426.93x = 18,647.69 × 8,913.15
4. Step 4: Simplify right side
   12,426.93x = 166,209,613.56
5. Step 5: Solve for x
   x = 166,209,613.56/12,426.93
6. Step 6: Final answer
   x = 13,374.95