Finding the Fourth Proportional to 1,384.18, 2,075.72 and 690.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,384.18 : 2,075.72 = 690.60 : x
2. Step 2: Convert to fraction form
   1,384.18/2,075.72 = 690.60/x
3. Step 3: Cross multiply
   1,384.18x = 2,075.72 × 690.60
4. Step 4: Simplify right side
   1,384.18x = 1,433,492.23
5. Step 5: Solve for x
   x = 1,433,492.23/1,384.18
6. Step 6: Final answer
   x = 1,035.63