Finding the Fourth Proportional to 2,779.96, 4,167.21 and 1,320.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,779.96 : 4,167.21 = 1,320.14 : x
2. Step 2: Convert to fraction form
   2,779.96/4,167.21 = 1,320.14/x
3. Step 3: Cross multiply
   2,779.96x = 4,167.21 × 1,320.14
4. Step 4: Simplify right side
   2,779.96x = 5,501,300.61
5. Step 5: Solve for x
   x = 5,501,300.61/2,779.96
6. Step 6: Final answer
   x = 1,978.91