Finding the Fourth Proportional to 2,071.17, 2,858.29 and 1,231.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,071.17 : 2,858.29 = 1,231.81 : x
2. Step 2: Convert to fraction form
   2,071.17/2,858.29 = 1,231.81/x
3. Step 3: Cross multiply
   2,071.17x = 2,858.29 × 1,231.81
4. Step 4: Simplify right side
   2,071.17x = 3,520,859.98
5. Step 5: Solve for x
   x = 3,520,859.98/2,071.17
6. Step 6: Final answer
   x = 1,699.94