Finding the Fourth Proportional to 1,071.83, 1,608.66 and 423.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.83 : 1,608.66 = 423.02 : x
2. Step 2: Convert to fraction form
   1,071.83/1,608.66 = 423.02/x
3. Step 3: Cross multiply
   1,071.83x = 1,608.66 × 423.02
4. Step 4: Simplify right side
   1,071.83x = 680,499.37
5. Step 5: Solve for x
   x = 680,499.37/1,071.83
6. Step 6: Final answer
   x = 634.89