Finding the Fourth Proportional to 1,407.06, 1,936.98 and 1,209.42

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.06 : 1,936.98 = 1,209.42 : x
2. Step 2: Convert to fraction form
   1,407.06/1,936.98 = 1,209.42/x
3. Step 3: Cross multiply
   1,407.06x = 1,936.98 × 1,209.42
4. Step 4: Simplify right side
   1,407.06x = 2,342,622.35
5. Step 5: Solve for x
   x = 2,342,622.35/1,407.06
6. Step 6: Final answer
   x = 1,664.91