Finding the Fourth Proportional to 12,870.46, 19,293.36 and 4,099.69

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.46 : 19,293.36 = 4,099.69 : x
2. Step 2: Convert to fraction form
   12,870.46/19,293.36 = 4,099.69/x
3. Step 3: Cross multiply
   12,870.46x = 19,293.36 × 4,099.69
4. Step 4: Simplify right side
   12,870.46x = 79,096,795.06
5. Step 5: Solve for x
   x = 79,096,795.06/12,870.46
6. Step 6: Final answer
   x = 6,145.61