Finding the Fourth Proportional to 2,151.31, 2,968.86 and 1,219.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.31 : 2,968.86 = 1,219.81 : x
2. Step 2: Convert to fraction form
   2,151.31/2,968.86 = 1,219.81/x
3. Step 3: Cross multiply
   2,151.31x = 2,968.86 × 1,219.81
4. Step 4: Simplify right side
   2,151.31x = 3,621,445.12
5. Step 5: Solve for x
   x = 3,621,445.12/2,151.31
6. Step 6: Final answer
   x = 1,683.37