Finding the Fourth Proportional to 1,699.56, 2,555.22 and 1,338.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,699.56 : 2,555.22 = 1,338.72 : x
2. Step 2: Convert to fraction form
   1,699.56/2,555.22 = 1,338.72/x
3. Step 3: Cross multiply
   1,699.56x = 2,555.22 × 1,338.72
4. Step 4: Simplify right side
   1,699.56x = 3,420,724.12
5. Step 5: Solve for x
   x = 3,420,724.12/1,699.56
6. Step 6: Final answer
   x = 2,012.71