Finding the Fourth Proportional to 12,858.72, 19,290.80 and 4,094.36

Step by Step Solution

1. Step 1: Write the proportion equation
   12,858.72 : 19,290.80 = 4,094.36 : x
2. Step 2: Convert to fraction form
   12,858.72/19,290.80 = 4,094.36/x
3. Step 3: Cross multiply
   12,858.72x = 19,290.80 × 4,094.36
4. Step 4: Simplify right side
   12,858.72x = 78,983,479.89
5. Step 5: Solve for x
   x = 78,983,479.89/12,858.72
6. Step 6: Final answer
   x = 6,142.41