Finding the Fourth Proportional to 2,085.48, 3,129.22 and 1,219.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.48 : 3,129.22 = 1,219.86 : x
2. Step 2: Convert to fraction form
   2,085.48/3,129.22 = 1,219.86/x
3. Step 3: Cross multiply
   2,085.48x = 3,129.22 × 1,219.86
4. Step 4: Simplify right side
   2,085.48x = 3,817,210.31
5. Step 5: Solve for x
   x = 3,817,210.31/2,085.48
6. Step 6: Final answer
   x = 1,830.37