Finding the Fourth Proportional to 2,013.76, 2,779.12 and 1,129.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,013.76 : 2,779.12 = 1,129.58 : x
2. Step 2: Convert to fraction form
   2,013.76/2,779.12 = 1,129.58/x
3. Step 3: Cross multiply
   2,013.76x = 2,779.12 × 1,129.58
4. Step 4: Simplify right side
   2,013.76x = 3,139,238.37
5. Step 5: Solve for x
   x = 3,139,238.37/2,013.76
6. Step 6: Final answer
   x = 1,558.89