Finding the Fourth Proportional to 3,555.30, 5,326.15 and 1,911.30

Step by Step Solution

1. Step 1: Write the proportion equation
   3,555.30 : 5,326.15 = 1,911.30 : x
2. Step 2: Convert to fraction form
   3,555.30/5,326.15 = 1,911.30/x
3. Step 3: Cross multiply
   3,555.30x = 5,326.15 × 1,911.30
4. Step 4: Simplify right side
   3,555.30x = 10,179,870.50
5. Step 5: Solve for x
   x = 10,179,870.50/3,555.30
6. Step 6: Final answer
   x = 2,863.29