Finding the Fourth Proportional to 12,784.29, 19,179.33 and 3,900.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,784.29 : 19,179.33 = 3,900.42 : x
2. Step 2: Convert to fraction form
   12,784.29/19,179.33 = 3,900.42/x
3. Step 3: Cross multiply
   12,784.29x = 19,179.33 × 3,900.42
4. Step 4: Simplify right side
   12,784.29x = 74,807,442.32
5. Step 5: Solve for x
   x = 74,807,442.32/12,784.29
6. Step 6: Final answer
   x = 5,851.51