Finding the Fourth Proportional to 2,085.98, 3,129.57 and 988.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.98 : 3,129.57 = 988.83 : x
2. Step 2: Convert to fraction form
   2,085.98/3,129.57 = 988.83/x
3. Step 3: Cross multiply
   2,085.98x = 3,129.57 × 988.83
4. Step 4: Simplify right side
   2,085.98x = 3,094,612.70
5. Step 5: Solve for x
   x = 3,094,612.70/2,085.98
6. Step 6: Final answer
   x = 1,483.53