Finding the Fourth Proportional to 1,061.89, 1,465.56 and 642.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.89 : 1,465.56 = 642.29 : x
2. Step 2: Convert to fraction form
   1,061.89/1,465.56 = 642.29/x
3. Step 3: Cross multiply
   1,061.89x = 1,465.56 × 642.29
4. Step 4: Simplify right side
   1,061.89x = 941,314.53
5. Step 5: Solve for x
   x = 941,314.53/1,061.89
6. Step 6: Final answer
   x = 886.45