Finding the Fourth Proportional to 12,720.18, 17,554.92 and 7,056.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,720.18 : 17,554.92 = 7,056.72 : x
2. Step 2: Convert to fraction form
   12,720.18/17,554.92 = 7,056.72/x
3. Step 3: Cross multiply
   12,720.18x = 17,554.92 × 7,056.72
4. Step 4: Simplify right side
   12,720.18x = 123,880,155.06
5. Step 5: Solve for x
   x = 123,880,155.06/12,720.18
6. Step 6: Final answer
   x = 9,738.87