Finding the Fourth Proportional to 11,406.76, 15,735.90 and 7,426.40

Step by Step Solution

1. Step 1: Write the proportion equation
   11,406.76 : 15,735.90 = 7,426.40 : x
2. Step 2: Convert to fraction form
   11,406.76/15,735.90 = 7,426.40/x
3. Step 3: Cross multiply
   11,406.76x = 15,735.90 × 7,426.40
4. Step 4: Simplify right side
   11,406.76x = 116,861,087.76
5. Step 5: Solve for x
   x = 116,861,087.76/11,406.76
6. Step 6: Final answer
   x = 10,244.90