Finding the Fourth Proportional to 12,869.47, 19,218.56 and 12,730.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,869.47 : 19,218.56 = 12,730.30 : x
2. Step 2: Convert to fraction form
   12,869.47/19,218.56 = 12,730.30/x
3. Step 3: Cross multiply
   12,869.47x = 19,218.56 × 12,730.30
4. Step 4: Simplify right side
   12,869.47x = 244,658,030.77
5. Step 5: Solve for x
   x = 244,658,030.77/12,869.47
6. Step 6: Final answer
   x = 19,010.74