Finding the Fourth Proportional to 1,035.82, 1,429.78 and 643.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,035.82 : 1,429.78 = 643.06 : x
2. Step 2: Convert to fraction form
   1,035.82/1,429.78 = 643.06/x
3. Step 3: Cross multiply
   1,035.82x = 1,429.78 × 643.06
4. Step 4: Simplify right side
   1,035.82x = 919,434.33
5. Step 5: Solve for x
   x = 919,434.33/1,035.82
6. Step 6: Final answer
   x = 887.64