Finding the Fourth Proportional to 11,611.81, 16,026.83 and 7,139.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,611.81 : 16,026.83 = 7,139.40 : x
2. Step 2: Convert to fraction form
   11,611.81/16,026.83 = 7,139.40/x
3. Step 3: Cross multiply
   11,611.81x = 16,026.83 × 7,139.40
4. Step 4: Simplify right side
   11,611.81x = 114,421,950.10
5. Step 5: Solve for x
   x = 114,421,950.10/11,611.81
6. Step 6: Final answer
   x = 9,853.93