Finding the Fourth Proportional to 12,636.77, 18,958.99 and 5,978.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,636.77 : 18,958.99 = 5,978.38 : x
2. Step 2: Convert to fraction form
   12,636.77/18,958.99 = 5,978.38/x
3. Step 3: Cross multiply
   12,636.77x = 18,958.99 × 5,978.38
4. Step 4: Simplify right side
   12,636.77x = 113,343,985.42
5. Step 5: Solve for x
   x = 113,343,985.42/12,636.77
6. Step 6: Final answer
   x = 8,969.38