Finding the Fourth Proportional to 12,978.04, 19,467.60 and 5,577.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.04 : 19,467.60 = 5,577.43 : x
2. Step 2: Convert to fraction form
   12,978.04/19,467.60 = 5,577.43/x
3. Step 3: Cross multiply
   12,978.04x = 19,467.60 × 5,577.43
4. Step 4: Simplify right side
   12,978.04x = 108,579,176.27
5. Step 5: Solve for x
   x = 108,579,176.27/12,978.04
6. Step 6: Final answer
   x = 8,366.38