Finding the Fourth Proportional to 2,188.31, 3,019.50 and 1,256.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,188.31 : 3,019.50 = 1,256.63 : x
2. Step 2: Convert to fraction form
   2,188.31/3,019.50 = 1,256.63/x
3. Step 3: Cross multiply
   2,188.31x = 3,019.50 × 1,256.63
4. Step 4: Simplify right side
   2,188.31x = 3,794,379.19
5. Step 5: Solve for x
   x = 3,794,379.19/2,188.31
6. Step 6: Final answer
   x = 1,733.94