Finding the Fourth Proportional to 1,084.05, 1,496.10 and 642.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,084.05 : 1,496.10 = 642.06 : x
2. Step 2: Convert to fraction form
   1,084.05/1,496.10 = 642.06/x
3. Step 3: Cross multiply
   1,084.05x = 1,496.10 × 642.06
4. Step 4: Simplify right side
   1,084.05x = 960,588.37
5. Step 5: Solve for x
   x = 960,588.37/1,084.05
6. Step 6: Final answer
   x = 886.11