Finding the Fourth Proportional to 1,068.93, 1,604.31 and 420.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,068.93 : 1,604.31 = 420.12 : x
2. Step 2: Convert to fraction form
   1,068.93/1,604.31 = 420.12/x
3. Step 3: Cross multiply
   1,068.93x = 1,604.31 × 420.12
4. Step 4: Simplify right side
   1,068.93x = 674,002.72
5. Step 5: Solve for x
   x = 674,002.72/1,068.93
6. Step 6: Final answer
   x = 630.54