Finding the Fourth Proportional to 1,079.98, 1,619.55 and 668.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.98 : 1,619.55 = 668.50 : x
2. Step 2: Convert to fraction form
   1,079.98/1,619.55 = 668.50/x
3. Step 3: Cross multiply
   1,079.98x = 1,619.55 × 668.50
4. Step 4: Simplify right side
   1,079.98x = 1,082,669.18
5. Step 5: Solve for x
   x = 1,082,669.18/1,079.98
6. Step 6: Final answer
   x = 1,002.49