Finding the Fourth Proportional to 12,907.55, 19,363.12 and 4,145.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,907.55 : 19,363.12 = 4,145.15 : x
2. Step 2: Convert to fraction form
   12,907.55/19,363.12 = 4,145.15/x
3. Step 3: Cross multiply
   12,907.55x = 19,363.12 × 4,145.15
4. Step 4: Simplify right side
   12,907.55x = 80,262,929.69
5. Step 5: Solve for x
   x = 80,262,929.69/12,907.55
6. Step 6: Final answer
   x = 6,218.30