Finding the Fourth Proportional to 1,185.61, 1,779 and 1,039.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,185.61 : 1,779 = 1,039.18 : x
2. Step 2: Convert to fraction form
   1,185.61/1,779 = 1,039.18/x
3. Step 3: Cross multiply
   1,185.61x = 1,779 × 1,039.18
4. Step 4: Simplify right side
   1,185.61x = 1,848,701.22
5. Step 5: Solve for x
   x = 1,848,701.22/1,185.61
6. Step 6: Final answer
   x = 1,559.28