Finding the Fourth Proportional to 2,159.67, 2,980.59 and 1,215.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.67 : 2,980.59 = 1,215.49 : x
2. Step 2: Convert to fraction form
   2,159.67/2,980.59 = 1,215.49/x
3. Step 3: Cross multiply
   2,159.67x = 2,980.59 × 1,215.49
4. Step 4: Simplify right side
   2,159.67x = 3,622,877.34
5. Step 5: Solve for x
   x = 3,622,877.34/2,159.67
6. Step 6: Final answer
   x = 1,677.51