Finding the Fourth Proportional to 1,369.72, 2,051.94 and 1,057.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,369.72 : 2,051.94 = 1,057.72 : x
2. Step 2: Convert to fraction form
   1,369.72/2,051.94 = 1,057.72/x
3. Step 3: Cross multiply
   1,369.72x = 2,051.94 × 1,057.72
4. Step 4: Simplify right side
   1,369.72x = 2,170,377.98
5. Step 5: Solve for x
   x = 2,170,377.98/1,369.72
6. Step 6: Final answer
   x = 1,584.54