Finding the Fourth Proportional to 12,956.19, 19,429.42 and 4,188.75

Step by Step Solution

1. Step 1: Write the proportion equation
   12,956.19 : 19,429.42 = 4,188.75 : x
2. Step 2: Convert to fraction form
   12,956.19/19,429.42 = 4,188.75/x
3. Step 3: Cross multiply
   12,956.19x = 19,429.42 × 4,188.75
4. Step 4: Simplify right side
   12,956.19x = 81,384,983.03
5. Step 5: Solve for x
   x = 81,384,983.03/12,956.19
6. Step 6: Final answer
   x = 6,281.55