Finding the Fourth Proportional to 1,114.41, 1,537.89 and 642.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,114.41 : 1,537.89 = 642.32 : x
2. Step 2: Convert to fraction form
   1,114.41/1,537.89 = 642.32/x
3. Step 3: Cross multiply
   1,114.41x = 1,537.89 × 642.32
4. Step 4: Simplify right side
   1,114.41x = 987,809.82
5. Step 5: Solve for x
   x = 987,809.82/1,114.41
6. Step 6: Final answer
   x = 886.40