Finding the Fourth Proportional to 12,978.72, 19,474.44 and 8,047.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.72 : 19,474.44 = 8,047.08 : x
2. Step 2: Convert to fraction form
   12,978.72/19,474.44 = 8,047.08/x
3. Step 3: Cross multiply
   12,978.72x = 19,474.44 × 8,047.08
4. Step 4: Simplify right side
   12,978.72x = 156,712,376.64
5. Step 5: Solve for x
   x = 156,712,376.64/12,978.72
6. Step 6: Final answer
   x = 12,074.56