Finding the Fourth Proportional to 1,779.87, 2,667.11 and 1,128.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,779.87 : 2,667.11 = 1,128.63 : x
2. Step 2: Convert to fraction form
   1,779.87/2,667.11 = 1,128.63/x
3. Step 3: Cross multiply
   1,779.87x = 2,667.11 × 1,128.63
4. Step 4: Simplify right side
   1,779.87x = 3,010,174.72
5. Step 5: Solve for x
   x = 3,010,174.72/1,779.87
6. Step 6: Final answer
   x = 1,691.23