Finding the Fourth Proportional to 2,159.71, 2,980.32 and 1,215.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.71 : 2,980.32 = 1,215.52 : x
2. Step 2: Convert to fraction form
   2,159.71/2,980.32 = 1,215.52/x
3. Step 3: Cross multiply
   2,159.71x = 2,980.32 × 1,215.52
4. Step 4: Simplify right side
   2,159.71x = 3,622,638.57
5. Step 5: Solve for x
   x = 3,622,638.57/2,159.71
6. Step 6: Final answer
   x = 1,677.37