Finding the Fourth Proportional to 13,481, 18,603.78 and 7,892

Step by Step Solution

1. Step 1: Write the proportion equation
   13,481 : 18,603.78 = 7,892 : x
2. Step 2: Convert to fraction form
   13,481/18,603.78 = 7,892/x
3. Step 3: Cross multiply
   13,481x = 18,603.78 × 7,892
4. Step 4: Simplify right side
   13,481x = 146,821,031.76
5. Step 5: Solve for x
   x = 146,821,031.76/13,481
6. Step 6: Final answer
   x = 10,890.96