Finding the Fourth Proportional to 1,428.31, 1,971.16 and 798.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.31 : 1,971.16 = 798.89 : x
2. Step 2: Convert to fraction form
   1,428.31/1,971.16 = 798.89/x
3. Step 3: Cross multiply
   1,428.31x = 1,971.16 × 798.89
4. Step 4: Simplify right side
   1,428.31x = 1,574,749.69
5. Step 5: Solve for x
   x = 1,574,749.69/1,428.31
6. Step 6: Final answer
   x = 1,102.53