Finding the Fourth Proportional to 1,071.98, 1,606.43 and 608.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.98 : 1,606.43 = 608.78 : x
2. Step 2: Convert to fraction form
   1,071.98/1,606.43 = 608.78/x
3. Step 3: Cross multiply
   1,071.98x = 1,606.43 × 608.78
4. Step 4: Simplify right side
   1,071.98x = 977,951.38
5. Step 5: Solve for x
   x = 977,951.38/1,071.98
6. Step 6: Final answer
   x = 912.29