Finding the Fourth Proportional to 1,783.60, 2,674.18 and 859.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,783.60 : 2,674.18 = 859.59 : x
2. Step 2: Convert to fraction form
   1,783.60/2,674.18 = 859.59/x
3. Step 3: Cross multiply
   1,783.60x = 2,674.18 × 859.59
4. Step 4: Simplify right side
   1,783.60x = 2,298,699.46
5. Step 5: Solve for x
   x = 2,298,699.46/1,783.60
6. Step 6: Final answer
   x = 1,288.80