Finding the Fourth Proportional to 1,407.41, 2,111.57 and 676.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.41 : 2,111.57 = 676.89 : x
2. Step 2: Convert to fraction form
   1,407.41/2,111.57 = 676.89/x
3. Step 3: Cross multiply
   1,407.41x = 2,111.57 × 676.89
4. Step 4: Simplify right side
   1,407.41x = 1,429,307.59
5. Step 5: Solve for x
   x = 1,429,307.59/1,407.41
6. Step 6: Final answer
   x = 1,015.56