Finding the Fourth Proportional to 1,386.98, 1,908.29 and 1,053.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,386.98 : 1,908.29 = 1,053.45 : x
2. Step 2: Convert to fraction form
   1,386.98/1,908.29 = 1,053.45/x
3. Step 3: Cross multiply
   1,386.98x = 1,908.29 × 1,053.45
4. Step 4: Simplify right side
   1,386.98x = 2,010,282.83
5. Step 5: Solve for x
   x = 2,010,282.83/1,386.98
6. Step 6: Final answer
   x = 1,449.40