Finding the Fourth Proportional to 12,356.61, 17,047.90 and 7,047.60

Step by Step Solution

1. Step 1: Write the proportion equation
   12,356.61 : 17,047.90 = 7,047.60 : x
2. Step 2: Convert to fraction form
   12,356.61/17,047.90 = 7,047.60/x
3. Step 3: Cross multiply
   12,356.61x = 17,047.90 × 7,047.60
4. Step 4: Simplify right side
   12,356.61x = 120,146,780.04
5. Step 5: Solve for x
   x = 120,146,780.04/12,356.61
6. Step 6: Final answer
   x = 9,723.28