Finding the Fourth Proportional to 1,861.30, 2,569.17 and 1,198.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,861.30 : 2,569.17 = 1,198.15 : x
2. Step 2: Convert to fraction form
   1,861.30/2,569.17 = 1,198.15/x
3. Step 3: Cross multiply
   1,861.30x = 2,569.17 × 1,198.15
4. Step 4: Simplify right side
   1,861.30x = 3,078,254.20
5. Step 5: Solve for x
   x = 3,078,254.20/1,861.30
6. Step 6: Final answer
   x = 1,653.82