Finding the Fourth Proportional to 12,867.72, 19,310.79 and 5,477.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,867.72 : 19,310.79 = 5,477.37 : x
2. Step 2: Convert to fraction form
   12,867.72/19,310.79 = 5,477.37/x
3. Step 3: Cross multiply
   12,867.72x = 19,310.79 × 5,477.37
4. Step 4: Simplify right side
   12,867.72x = 105,772,341.82
5. Step 5: Solve for x
   x = 105,772,341.82/12,867.72
6. Step 6: Final answer
   x = 8,219.98