Finding the Fourth Proportional to 12,898.86, 19,341.81 and 5,978.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,898.86 : 19,341.81 = 5,978.22 : x
2. Step 2: Convert to fraction form
   12,898.86/19,341.81 = 5,978.22/x
3. Step 3: Cross multiply
   12,898.86x = 19,341.81 × 5,978.22
4. Step 4: Simplify right side
   12,898.86x = 115,629,595.38
5. Step 5: Solve for x
   x = 115,629,595.38/12,898.86
6. Step 6: Final answer
   x = 8,964.33