Finding the Fourth Proportional to 2,151.82, 2,969.76 and 1,220.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,151.82 : 2,969.76 = 1,220.32 : x
2. Step 2: Convert to fraction form
   2,151.82/2,969.76 = 1,220.32/x
3. Step 3: Cross multiply
   2,151.82x = 2,969.76 × 1,220.32
4. Step 4: Simplify right side
   2,151.82x = 3,624,057.52
5. Step 5: Solve for x
   x = 3,624,057.52/2,151.82
6. Step 6: Final answer
   x = 1,684.18