Finding the Fourth Proportional to 1,958.42, 2,702.72 and 1,212.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,958.42 : 2,702.72 = 1,212.78 : x
2. Step 2: Convert to fraction form
   1,958.42/2,702.72 = 1,212.78/x
3. Step 3: Cross multiply
   1,958.42x = 2,702.72 × 1,212.78
4. Step 4: Simplify right side
   1,958.42x = 3,277,804.76
5. Step 5: Solve for x
   x = 3,277,804.76/1,958.42
6. Step 6: Final answer
   x = 1,673.70