Finding the Fourth Proportional to 12,978.40, 19,472.12 and 4,095.10

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.40 : 19,472.12 = 4,095.10 : x
2. Step 2: Convert to fraction form
   12,978.40/19,472.12 = 4,095.10/x
3. Step 3: Cross multiply
   12,978.40x = 19,472.12 × 4,095.10
4. Step 4: Simplify right side
   12,978.40x = 79,740,278.61
5. Step 5: Solve for x
   x = 79,740,278.61/12,978.40
6. Step 6: Final answer
   x = 6,144.08