Finding the Fourth Proportional to 12,345.72, 17,036.93 and 7,040.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,345.72 : 17,036.93 = 7,040.42 : x
2. Step 2: Convert to fraction form
   12,345.72/17,036.93 = 7,040.42/x
3. Step 3: Cross multiply
   12,345.72x = 17,036.93 × 7,040.42
4. Step 4: Simplify right side
   12,345.72x = 119,947,139.02
5. Step 5: Solve for x
   x = 119,947,139.02/12,345.72
6. Step 6: Final answer
   x = 9,715.69