Finding the Fourth Proportional to 1,429.12, 2,141.61 and 842.74

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.12 : 2,141.61 = 842.74 : x
2. Step 2: Convert to fraction form
   1,429.12/2,141.61 = 842.74/x
3. Step 3: Cross multiply
   1,429.12x = 2,141.61 × 842.74
4. Step 4: Simplify right side
   1,429.12x = 1,804,820.41
5. Step 5: Solve for x
   x = 1,804,820.41/1,429.12
6. Step 6: Final answer
   x = 1,262.89