Finding the Fourth Proportional to 2,011.89, 2,776.59 and 1,115.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,011.89 : 2,776.59 = 1,115.72 : x
2. Step 2: Convert to fraction form
   2,011.89/2,776.59 = 1,115.72/x
3. Step 3: Cross multiply
   2,011.89x = 2,776.59 × 1,115.72
4. Step 4: Simplify right side
   2,011.89x = 3,097,896.99
5. Step 5: Solve for x
   x = 3,097,896.99/2,011.89
6. Step 6: Final answer
   x = 1,539.79