Finding the Fourth Proportional to 2,085.12, 3,127.64 and 698.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.12 : 3,127.64 = 698.56 : x
2. Step 2: Convert to fraction form
   2,085.12/3,127.64 = 698.56/x
3. Step 3: Cross multiply
   2,085.12x = 3,127.64 × 698.56
4. Step 4: Simplify right side
   2,085.12x = 2,184,844.20
5. Step 5: Solve for x
   x = 2,184,844.20/2,085.12
6. Step 6: Final answer
   x = 1,047.83