Finding the Fourth Proportional to 1,150.69, 1,725.18 and 420.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,150.69 : 1,725.18 = 420.27 : x
2. Step 2: Convert to fraction form
   1,150.69/1,725.18 = 420.27/x
3. Step 3: Cross multiply
   1,150.69x = 1,725.18 × 420.27
4. Step 4: Simplify right side
   1,150.69x = 725,041.40
5. Step 5: Solve for x
   x = 725,041.40/1,150.69
6. Step 6: Final answer
   x = 630.09