Finding the Fourth Proportional to 2,151.06, 2,968.72 and 1,206.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.06 : 2,968.72 = 1,206.90 : x
2. Step 2: Convert to fraction form
   2,151.06/2,968.72 = 1,206.90/x
3. Step 3: Cross multiply
   2,151.06x = 2,968.72 × 1,206.90
4. Step 4: Simplify right side
   2,151.06x = 3,582,948.17
5. Step 5: Solve for x
   x = 3,582,948.17/2,151.06
6. Step 6: Final answer
   x = 1,665.67