Finding the Fourth Proportional to 12,345.68, 17,036.61 and 7,042.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,345.68 : 17,036.61 = 7,042.20 : x
2. Step 2: Convert to fraction form
   12,345.68/17,036.61 = 7,042.20/x
3. Step 3: Cross multiply
   12,345.68x = 17,036.61 × 7,042.20
4. Step 4: Simplify right side
   12,345.68x = 119,975,214.94
5. Step 5: Solve for x
   x = 119,975,214.94/12,345.68
6. Step 6: Final answer
   x = 9,717.99