Finding the Fourth Proportional to 3,889.30, 5,834.91 and 1,256.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,889.30 : 5,834.91 = 1,256.80 : x
2. Step 2: Convert to fraction form
   3,889.30/5,834.91 = 1,256.80/x
3. Step 3: Cross multiply
   3,889.30x = 5,834.91 × 1,256.80
4. Step 4: Simplify right side
   3,889.30x = 7,333,314.89
5. Step 5: Solve for x
   x = 7,333,314.89/3,889.30
6. Step 6: Final answer
   x = 1,885.51