Finding the Fourth Proportional to 12,942.90, 19,415.61 and 5,149.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,942.90 : 19,415.61 = 5,149.89 : x
2. Step 2: Convert to fraction form
   12,942.90/19,415.61 = 5,149.89/x
3. Step 3: Cross multiply
   12,942.90x = 19,415.61 × 5,149.89
4. Step 4: Simplify right side
   12,942.90x = 99,988,255.78
5. Step 5: Solve for x
   x = 99,988,255.78/12,942.90
6. Step 6: Final answer
   x = 7,725.34