Finding the Fourth Proportional to 1,428.61, 1,971.03 and 799.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.61 : 1,971.03 = 799.05 : x
2. Step 2: Convert to fraction form
   1,428.61/1,971.03 = 799.05/x
3. Step 3: Cross multiply
   1,428.61x = 1,971.03 × 799.05
4. Step 4: Simplify right side
   1,428.61x = 1,574,951.52
5. Step 5: Solve for x
   x = 1,574,951.52/1,428.61
6. Step 6: Final answer
   x = 1,102.44