Finding the Fourth Proportional to 13,607.46, 18,777.69 and 7,639.02

Step by Step Solution

1. Step 1: Write the proportion equation
   13,607.46 : 18,777.69 = 7,639.02 : x
2. Step 2: Convert to fraction form
   13,607.46/18,777.69 = 7,639.02/x
3. Step 3: Cross multiply
   13,607.46x = 18,777.69 × 7,639.02
4. Step 4: Simplify right side
   13,607.46x = 143,443,149.46
5. Step 5: Solve for x
   x = 143,443,149.46/13,607.46
6. Step 6: Final answer
   x = 10,541.51