Finding the Fourth Proportional to 1,071.78, 1,606.61 and 552.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.78 : 1,606.61 = 552.03 : x
2. Step 2: Convert to fraction form
   1,071.78/1,606.61 = 552.03/x
3. Step 3: Cross multiply
   1,071.78x = 1,606.61 × 552.03
4. Step 4: Simplify right side
   1,071.78x = 886,894.16
5. Step 5: Solve for x
   x = 886,894.16/1,071.78
6. Step 6: Final answer
   x = 827.50