Finding the Fourth Proportional to 1,779.52, 2,679.68 and 1,320.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,779.52 : 2,679.68 = 1,320.56 : x
2. Step 2: Convert to fraction form
   1,779.52/2,679.68 = 1,320.56/x
3. Step 3: Cross multiply
   1,779.52x = 2,679.68 × 1,320.56
4. Step 4: Simplify right side
   1,779.52x = 3,538,678.22
5. Step 5: Solve for x
   x = 3,538,678.22/1,779.52
6. Step 6: Final answer
   x = 1,988.56