Finding the Fourth Proportional to 12,678.56, 19,017.68 and 4,358.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,678.56 : 19,017.68 = 4,358.72 : x
2. Step 2: Convert to fraction form
   12,678.56/19,017.68 = 4,358.72/x
3. Step 3: Cross multiply
   12,678.56x = 19,017.68 × 4,358.72
4. Step 4: Simplify right side
   12,678.56x = 82,892,742.17
5. Step 5: Solve for x
   x = 82,892,742.17/12,678.56
6. Step 6: Final answer
   x = 6,538.02