Finding the Fourth Proportional to 13,699.98, 18,906.03 and 7,731.72

Step by Step Solution

1. Step 1: Write the proportion equation
   13,699.98 : 18,906.03 = 7,731.72 : x
2. Step 2: Convert to fraction form
   13,699.98/18,906.03 = 7,731.72/x
3. Step 3: Cross multiply
   13,699.98x = 18,906.03 × 7,731.72
4. Step 4: Simplify right side
   13,699.98x = 146,176,130.27
5. Step 5: Solve for x
   x = 146,176,130.27/13,699.98
6. Step 6: Final answer
   x = 10,669.81