Finding the Fourth Proportional to 12,945.30, 19,404.87 and 5,042.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,945.30 : 19,404.87 = 5,042.87 : x
2. Step 2: Convert to fraction form
   12,945.30/19,404.87 = 5,042.87/x
3. Step 3: Cross multiply
   12,945.30x = 19,404.87 × 5,042.87
4. Step 4: Simplify right side
   12,945.30x = 97,856,236.78
5. Step 5: Solve for x
   x = 97,856,236.78/12,945.30
6. Step 6: Final answer
   x = 7,559.21