Finding the Fourth Proportional to 866.59, 1,300.42 and 404.13

Step by Step Solution

1. Step 1: Write the proportion equation
   866.59 : 1,300.42 = 404.13 : x
2. Step 2: Convert to fraction form
   866.59/1,300.42 = 404.13/x
3. Step 3: Cross multiply
   866.59x = 1,300.42 × 404.13
4. Step 4: Simplify right side
   866.59x = 525,537.72
5. Step 5: Solve for x
   x = 525,537.72/866.59
6. Step 6: Final answer
   x = 606.45