Finding the Fourth Proportional to 1,068.51, 1,601.69 and 418.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.51 : 1,601.69 = 418.35 : x
2. Step 2: Convert to fraction form
   1,068.51/1,601.69 = 418.35/x
3. Step 3: Cross multiply
   1,068.51x = 1,601.69 × 418.35
4. Step 4: Simplify right side
   1,068.51x = 670,064.92
5. Step 5: Solve for x
   x = 670,064.92/1,068.51
6. Step 6: Final answer
   x = 627.10