Finding the Fourth Proportional to 11,390.56, 17,080.80 and 3,490.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,390.56 : 17,080.80 = 3,490.72 : x
2. Step 2: Convert to fraction form
   11,390.56/17,080.80 = 3,490.72/x
3. Step 3: Cross multiply
   11,390.56x = 17,080.80 × 3,490.72
4. Step 4: Simplify right side
   11,390.56x = 59,624,290.18
5. Step 5: Solve for x
   x = 59,624,290.18/11,390.56
6. Step 6: Final answer
   x = 5,234.54