Finding the Fourth Proportional to 1,856.58, 2,784.69 and 1,339.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.58 : 2,784.69 = 1,339.02 : x
2. Step 2: Convert to fraction form
   1,856.58/2,784.69 = 1,339.02/x
3. Step 3: Cross multiply
   1,856.58x = 2,784.69 × 1,339.02
4. Step 4: Simplify right side
   1,856.58x = 3,728,755.60
5. Step 5: Solve for x
   x = 3,728,755.60/1,856.58
6. Step 6: Final answer
   x = 2,008.40