Finding the Fourth Proportional to 1,428.31, 1,971.11 and 798.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.31 : 1,971.11 = 798.86 : x
2. Step 2: Convert to fraction form
   1,428.31/1,971.11 = 798.86/x
3. Step 3: Cross multiply
   1,428.31x = 1,971.11 × 798.86
4. Step 4: Simplify right side
   1,428.31x = 1,574,632.01
5. Step 5: Solve for x
   x = 1,574,632.01/1,428.31
6. Step 6: Final answer
   x = 1,102.45