Finding the Fourth Proportional to 12,870.24, 19,272.69 and 10,784.76

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.24 : 19,272.69 = 10,784.76 : x
2. Step 2: Convert to fraction form
   12,870.24/19,272.69 = 10,784.76/x
3. Step 3: Cross multiply
   12,870.24x = 19,272.69 × 10,784.76
4. Step 4: Simplify right side
   12,870.24x = 207,851,336.20
5. Step 5: Solve for x
   x = 207,851,336.20/12,870.24
6. Step 6: Final answer
   x = 16,149.76