Finding the Fourth Proportional to 12,748.56, 19,112.52 and 3,978.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,748.56 : 19,112.52 = 3,978.96 : x
2. Step 2: Convert to fraction form
   12,748.56/19,112.52 = 3,978.96/x
3. Step 3: Cross multiply
   12,748.56x = 19,112.52 × 3,978.96
4. Step 4: Simplify right side
   12,748.56x = 76,047,952.58
5. Step 5: Solve for x
   x = 76,047,952.58/12,748.56
6. Step 6: Final answer
   x = 5,965.22