Finding the Fourth Proportional to 1,707.15, 2,558.90 and 1,218.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,707.15 : 2,558.90 = 1,218.72 : x
2. Step 2: Convert to fraction form
   1,707.15/2,558.90 = 1,218.72/x
3. Step 3: Cross multiply
   1,707.15x = 2,558.90 × 1,218.72
4. Step 4: Simplify right side
   1,707.15x = 3,118,563.72
5. Step 5: Solve for x
   x = 3,118,563.72/1,707.15
6. Step 6: Final answer
   x = 1,826.77