Finding the Fourth Proportional to 1,428.02, 1,970.47 and 798.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.02 : 1,970.47 = 798.51 : x
2. Step 2: Convert to fraction form
   1,428.02/1,970.47 = 798.51/x
3. Step 3: Cross multiply
   1,428.02x = 1,970.47 × 798.51
4. Step 4: Simplify right side
   1,428.02x = 1,573,448.39
5. Step 5: Solve for x
   x = 1,573,448.39/1,428.02
6. Step 6: Final answer
   x = 1,101.84