Finding the Fourth Proportional to 9,139.83, 13,631.77 and 8,981.88

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.83 : 13,631.77 = 8,981.88 : x
2. Step 2: Convert to fraction form
   9,139.83/13,631.77 = 8,981.88/x
3. Step 3: Cross multiply
   9,139.83x = 13,631.77 × 8,981.88
4. Step 4: Simplify right side
   9,139.83x = 122,438,922.33
5. Step 5: Solve for x
   x = 122,438,922.33/9,139.83
6. Step 6: Final answer
   x = 13,396.19