Finding the Fourth Proportional to 12,870.76, 19,308.70 and 5,475.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.76 : 19,308.70 = 5,475.16 : x
2. Step 2: Convert to fraction form
   12,870.76/19,308.70 = 5,475.16/x
3. Step 3: Cross multiply
   12,870.76x = 19,308.70 × 5,475.16
4. Step 4: Simplify right side
   12,870.76x = 105,718,221.89
5. Step 5: Solve for x
   x = 105,718,221.89/12,870.76
6. Step 6: Final answer
   x = 8,213.83