Finding the Fourth Proportional to 2,085.58, 2,878.62 and 1,246.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.58 : 2,878.62 = 1,246.78 : x
2. Step 2: Convert to fraction form
   2,085.58/2,878.62 = 1,246.78/x
3. Step 3: Cross multiply
   2,085.58x = 2,878.62 × 1,246.78
4. Step 4: Simplify right side
   2,085.58x = 3,588,999.61
5. Step 5: Solve for x
   x = 3,588,999.61/2,085.58
6. Step 6: Final answer
   x = 1,720.86