Finding the Fourth Proportional to 1,384.56, 2,075.69 and 690.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.56 : 2,075.69 = 690.39 : x
2. Step 2: Convert to fraction form
   1,384.56/2,075.69 = 690.39/x
3. Step 3: Cross multiply
   1,384.56x = 2,075.69 × 690.39
4. Step 4: Simplify right side
   1,384.56x = 1,433,037.35
5. Step 5: Solve for x
   x = 1,433,037.35/1,384.56
6. Step 6: Final answer
   x = 1,035.01