Finding the Fourth Proportional to 2,085.08, 3,128.12 and 698.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.08 : 3,128.12 = 698.43 : x
2. Step 2: Convert to fraction form
   2,085.08/3,128.12 = 698.43/x
3. Step 3: Cross multiply
   2,085.08x = 3,128.12 × 698.43
4. Step 4: Simplify right side
   2,085.08x = 2,184,757.21
5. Step 5: Solve for x
   x = 2,184,757.21/2,085.08
6. Step 6: Final answer
   x = 1,047.80