Finding the Fourth Proportional to 1,560.84, 2,336.40 and 1,215.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,560.84 : 2,336.40 = 1,215.18 : x
2. Step 2: Convert to fraction form
   1,560.84/2,336.40 = 1,215.18/x
3. Step 3: Cross multiply
   1,560.84x = 2,336.40 × 1,215.18
4. Step 4: Simplify right side
   1,560.84x = 2,839,146.55
5. Step 5: Solve for x
   x = 2,839,146.55/1,560.84
6. Step 6: Final answer
   x = 1,818.99