Finding the Fourth Proportional to 12,688.95, 17,511.90 and 7,025.04

Step by Step Solution

1. Step 1: Write the proportion equation
   12,688.95 : 17,511.90 = 7,025.04 : x
2. Step 2: Convert to fraction form
   12,688.95/17,511.90 = 7,025.04/x
3. Step 3: Cross multiply
   12,688.95x = 17,511.90 × 7,025.04
4. Step 4: Simplify right side
   12,688.95x = 123,021,797.98
5. Step 5: Solve for x
   x = 123,021,797.98/12,688.95
6. Step 6: Final answer
   x = 9,695.19