Finding the Fourth Proportional to 13,606.85, 18,776.42 and 7,637.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,606.85 : 18,776.42 = 7,637.37 : x
2. Step 2: Convert to fraction form
   13,606.85/18,776.42 = 7,637.37/x
3. Step 3: Cross multiply
   13,606.85x = 18,776.42 × 7,637.37
4. Step 4: Simplify right side
   13,606.85x = 143,402,485.91
5. Step 5: Solve for x
   x = 143,402,485.91/13,606.85
6. Step 6: Final answer
   x = 10,538.99