Finding the Fourth Proportional to 1,062.51, 1,465.39 and 642.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,062.51 : 1,465.39 = 642.83 : x
2. Step 2: Convert to fraction form
   1,062.51/1,465.39 = 642.83/x
3. Step 3: Cross multiply
   1,062.51x = 1,465.39 × 642.83
4. Step 4: Simplify right side
   1,062.51x = 941,996.65
5. Step 5: Solve for x
   x = 941,996.65/1,062.51
6. Step 6: Final answer
   x = 886.58