Finding the Fourth Proportional to 1,068.57, 1,603.76 and 419.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.57 : 1,603.76 = 419.76 : x
2. Step 2: Convert to fraction form
   1,068.57/1,603.76 = 419.76/x
3. Step 3: Cross multiply
   1,068.57x = 1,603.76 × 419.76
4. Step 4: Simplify right side
   1,068.57x = 673,194.30
5. Step 5: Solve for x
   x = 673,194.30/1,068.57
6. Step 6: Final answer
   x = 630.00