Finding the Fourth Proportional to 12,912.81, 19,367.40 and 4,146.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.81 : 19,367.40 = 4,146.59 : x
2. Step 2: Convert to fraction form
   12,912.81/19,367.40 = 4,146.59/x
3. Step 3: Cross multiply
   12,912.81x = 19,367.40 × 4,146.59
4. Step 4: Simplify right side
   12,912.81x = 80,308,667.17
5. Step 5: Solve for x
   x = 80,308,667.17/12,912.81
6. Step 6: Final answer
   x = 6,219.30