Finding the Fourth Proportional to 2,159.52, 2,980.18 and 1,215.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,159.52 : 2,980.18 = 1,215.30 : x
2. Step 2: Convert to fraction form
   2,159.52/2,980.18 = 1,215.30/x
3. Step 3: Cross multiply
   2,159.52x = 2,980.18 × 1,215.30
4. Step 4: Simplify right side
   2,159.52x = 3,621,812.75
5. Step 5: Solve for x
   x = 3,621,812.75/2,159.52
6. Step 6: Final answer
   x = 1,677.14