Finding the Fourth Proportional to 2,215.79, 3,321.91 and 1,045.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.79 : 3,321.91 = 1,045.17 : x
2. Step 2: Convert to fraction form
   2,215.79/3,321.91 = 1,045.17/x
3. Step 3: Cross multiply
   2,215.79x = 3,321.91 × 1,045.17
4. Step 4: Simplify right side
   2,215.79x = 3,471,961.98
5. Step 5: Solve for x
   x = 3,471,961.98/2,215.79
6. Step 6: Final answer
   x = 1,566.92