Finding the Fourth Proportional to 11,790.12, 17,690.58 and 7,406.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,790.12 : 17,690.58 = 7,406.40 : x
2. Step 2: Convert to fraction form
   11,790.12/17,690.58 = 7,406.40/x
3. Step 3: Cross multiply
   11,790.12x = 17,690.58 × 7,406.40
4. Step 4: Simplify right side
   11,790.12x = 131,023,511.71
5. Step 5: Solve for x
   x = 131,023,511.71/11,790.12
6. Step 6: Final answer
   x = 11,112.99