Finding the Fourth Proportional to 8,697.57, 12,002.72 and 5,111.57

Step by Step Solution

1. Step 1: Write the proportion equation
   8,697.57 : 12,002.72 = 5,111.57 : x
2. Step 2: Convert to fraction form
   8,697.57/12,002.72 = 5,111.57/x
3. Step 3: Cross multiply
   8,697.57x = 12,002.72 × 5,111.57
4. Step 4: Simplify right side
   8,697.57x = 61,352,657.90
5. Step 5: Solve for x
   x = 61,352,657.90/8,697.57
6. Step 6: Final answer
   x = 7,054.00