Finding the Fourth Proportional to 2,047.75, 3,070.31 and 878.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,047.75 : 3,070.31 = 878.51 : x
2. Step 2: Convert to fraction form
   2,047.75/3,070.31 = 878.51/x
3. Step 3: Cross multiply
   2,047.75x = 3,070.31 × 878.51
4. Step 4: Simplify right side
   2,047.75x = 2,697,301.32
5. Step 5: Solve for x
   x = 2,697,301.32/2,047.75
6. Step 6: Final answer
   x = 1,317.20