Finding the Fourth Proportional to 1,502.09, 2,072.43 and 872.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,502.09 : 2,072.43 = 872.50 : x
2. Step 2: Convert to fraction form
   1,502.09/2,072.43 = 872.50/x
3. Step 3: Cross multiply
   1,502.09x = 2,072.43 × 872.50
4. Step 4: Simplify right side
   1,502.09x = 1,808,196.33
5. Step 5: Solve for x
   x = 1,808,196.33/1,502.09
6. Step 6: Final answer
   x = 1,203.79