Finding the Fourth Proportional to 1,603.59, 2,406.10 and 872.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,603.59 : 2,406.10 = 872.07 : x
2. Step 2: Convert to fraction form
   1,603.59/2,406.10 = 872.07/x
3. Step 3: Cross multiply
   1,603.59x = 2,406.10 × 872.07
4. Step 4: Simplify right side
   1,603.59x = 2,098,287.63
5. Step 5: Solve for x
   x = 2,098,287.63/1,603.59
6. Step 6: Final answer
   x = 1,308.49