Finding the Fourth Proportional to 2,085.80, 3,126.32 and 988.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.80 : 3,126.32 = 988.61 : x
2. Step 2: Convert to fraction form
   2,085.80/3,126.32 = 988.61/x
3. Step 3: Cross multiply
   2,085.80x = 3,126.32 × 988.61
4. Step 4: Simplify right side
   2,085.80x = 3,090,706.27
5. Step 5: Solve for x
   x = 3,090,706.27/2,085.80
6. Step 6: Final answer
   x = 1,481.78