Finding the Fourth Proportional to 12,345.60, 17,033.70 and 7,039.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,345.60 : 17,033.70 = 7,039.42 : x
2. Step 2: Convert to fraction form
   12,345.60/17,033.70 = 7,039.42/x
3. Step 3: Cross multiply
   12,345.60x = 17,033.70 × 7,039.42
4. Step 4: Simplify right side
   12,345.60x = 119,907,368.45
5. Step 5: Solve for x
   x = 119,907,368.45/12,345.60
6. Step 6: Final answer
   x = 9,712.56