Finding the Fourth Proportional to 1,442.12, 1,990.01 and 852.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,442.12 : 1,990.01 = 852.55 : x
2. Step 2: Convert to fraction form
   1,442.12/1,990.01 = 852.55/x
3. Step 3: Cross multiply
   1,442.12x = 1,990.01 × 852.55
4. Step 4: Simplify right side
   1,442.12x = 1,696,583.03
5. Step 5: Solve for x
   x = 1,696,583.03/1,442.12
6. Step 6: Final answer
   x = 1,176.45