Finding the Fourth Proportional to 2,011.61, 3,018.69 and 1,087.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.61 : 3,018.69 = 1,087.80 : x
2. Step 2: Convert to fraction form
   2,011.61/3,018.69 = 1,087.80/x
3. Step 3: Cross multiply
   2,011.61x = 3,018.69 × 1,087.80
4. Step 4: Simplify right side
   2,011.61x = 3,283,730.98
5. Step 5: Solve for x
   x = 3,283,730.98/2,011.61
6. Step 6: Final answer
   x = 1,632.39