Finding the Fourth Proportional to 1,946.91, 2,686.72 and 1,200.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,946.91 : 2,686.72 = 1,200.57 : x
2. Step 2: Convert to fraction form
   1,946.91/2,686.72 = 1,200.57/x
3. Step 3: Cross multiply
   1,946.91x = 2,686.72 × 1,200.57
4. Step 4: Simplify right side
   1,946.91x = 3,225,603.65
5. Step 5: Solve for x
   x = 3,225,603.65/1,946.91
6. Step 6: Final answer
   x = 1,656.78