Finding the Fourth Proportional to 12,870.96, 19,301.46 and 5,478.84

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.96 : 19,301.46 = 5,478.84 : x
2. Step 2: Convert to fraction form
   12,870.96/19,301.46 = 5,478.84/x
3. Step 3: Cross multiply
   12,870.96x = 19,301.46 × 5,478.84
4. Step 4: Simplify right side
   12,870.96x = 105,749,611.11
5. Step 5: Solve for x
   x = 105,749,611.11/12,870.96
6. Step 6: Final answer
   x = 8,216.14