Finding the Fourth Proportional to 12,756.72, 17,603.82 and 7,091.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,756.72 : 17,603.82 = 7,091.40 : x
2. Step 2: Convert to fraction form
   12,756.72/17,603.82 = 7,091.40/x
3. Step 3: Cross multiply
   12,756.72x = 17,603.82 × 7,091.40
4. Step 4: Simplify right side
   12,756.72x = 124,835,729.15
5. Step 5: Solve for x
   x = 124,835,729.15/12,756.72
6. Step 6: Final answer
   x = 9,785.88