Finding the Fourth Proportional to 2,145.72, 3,218.16 and 1,048.98

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.72 : 3,218.16 = 1,048.98 : x
2. Step 2: Convert to fraction form
   2,145.72/3,218.16 = 1,048.98/x
3. Step 3: Cross multiply
   2,145.72x = 3,218.16 × 1,048.98
4. Step 4: Simplify right side
   2,145.72x = 3,375,785.48
5. Step 5: Solve for x
   x = 3,375,785.48/2,145.72
6. Step 6: Final answer
   x = 1,573.26