Finding the Fourth Proportional to 12,943.40, 19,419.35 and 4,178.39

Step by Step Solution

1. Step 1: Write the proportion equation
   12,943.40 : 19,419.35 = 4,178.39 : x
2. Step 2: Convert to fraction form
   12,943.40/19,419.35 = 4,178.39/x
3. Step 3: Cross multiply
   12,943.40x = 19,419.35 × 4,178.39
4. Step 4: Simplify right side
   12,943.40x = 81,141,499.86
5. Step 5: Solve for x
   x = 81,141,499.86/12,943.40
6. Step 6: Final answer
   x = 6,268.95