Finding the Fourth Proportional to 1,061.83, 1,465.14 and 642.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.83 : 1,465.14 = 642.13 : x
2. Step 2: Convert to fraction form
   1,061.83/1,465.14 = 642.13/x
3. Step 3: Cross multiply
   1,061.83x = 1,465.14 × 642.13
4. Step 4: Simplify right side
   1,061.83x = 940,805.48
5. Step 5: Solve for x
   x = 940,805.48/1,061.83
6. Step 6: Final answer
   x = 886.02