Finding the Fourth Proportional to 12,913.49, 17,817.33 and 7,877.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,913.49 : 17,817.33 = 7,877.39 : x
2. Step 2: Convert to fraction form
   12,913.49/17,817.33 = 7,877.39/x
3. Step 3: Cross multiply
   12,913.49x = 17,817.33 × 7,877.39
4. Step 4: Simplify right side
   12,913.49x = 140,353,997.62
5. Step 5: Solve for x
   x = 140,353,997.62/12,913.49
6. Step 6: Final answer
   x = 10,868.79