Finding the Fourth Proportional to 1,679.31, 2,506.72 and 1,555.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,679.31 : 2,506.72 = 1,555.79 : x
2. Step 2: Convert to fraction form
   1,679.31/2,506.72 = 1,555.79/x
3. Step 3: Cross multiply
   1,679.31x = 2,506.72 × 1,555.79
4. Step 4: Simplify right side
   1,679.31x = 3,899,913.49
5. Step 5: Solve for x
   x = 3,899,913.49/1,679.31
6. Step 6: Final answer
   x = 2,322.33