Finding the Fourth Proportional to 1,383.31, 2,075.73 and 1,075.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.31 : 2,075.73 = 1,075.78 : x
2. Step 2: Convert to fraction form
   1,383.31/2,075.73 = 1,075.78/x
3. Step 3: Cross multiply
   1,383.31x = 2,075.73 × 1,075.78
4. Step 4: Simplify right side
   1,383.31x = 2,233,028.82
5. Step 5: Solve for x
   x = 2,233,028.82/1,383.31
6. Step 6: Final answer
   x = 1,614.26