Finding the Fourth Proportional to 12,680.75, 19,019.00 and 3,913.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,680.75 : 19,019.00 = 3,913.31 : x
2. Step 2: Convert to fraction form
   12,680.75/19,019.00 = 3,913.31/x
3. Step 3: Cross multiply
   12,680.75x = 19,019.00 × 3,913.31
4. Step 4: Simplify right side
   12,680.75x = 74,427,300.22
5. Step 5: Solve for x
   x = 74,427,300.22/12,680.75
6. Step 6: Final answer
   x = 5,869.31