Finding the Fourth Proportional to 2,085.79, 3,127.21 and 1,045.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,085.79 : 3,127.21 = 1,045.05 : x
2. Step 2: Convert to fraction form
   2,085.79/3,127.21 = 1,045.05/x
3. Step 3: Cross multiply
   2,085.79x = 3,127.21 × 1,045.05
4. Step 4: Simplify right side
   2,085.79x = 3,268,090.81
5. Step 5: Solve for x
   x = 3,268,090.81/2,085.79
6. Step 6: Final answer
   x = 1,566.84