Finding the Fourth Proportional to 1,403.17, 1,936.56 and 872.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.17 : 1,936.56 = 872.07 : x
2. Step 2: Convert to fraction form
   1,403.17/1,936.56 = 872.07/x
3. Step 3: Cross multiply
   1,403.17x = 1,936.56 × 872.07
4. Step 4: Simplify right side
   1,403.17x = 1,688,806.98
5. Step 5: Solve for x
   x = 1,688,806.98/1,403.17
6. Step 6: Final answer
   x = 1,203.56