Finding the Fourth Proportional to 1,019.51, 1,528.42 and 872.70

Step by Step Solution

1. Step 1: Write the proportion equation
   1,019.51 : 1,528.42 = 872.70 : x
2. Step 2: Convert to fraction form
   1,019.51/1,528.42 = 872.70/x
3. Step 3: Cross multiply
   1,019.51x = 1,528.42 × 872.70
4. Step 4: Simplify right side
   1,019.51x = 1,333,852.13
5. Step 5: Solve for x
   x = 1,333,852.13/1,019.51
6. Step 6: Final answer
   x = 1,308.33