Finding the Fourth Proportional to 1,284.41, 1,925.55 and 553.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,284.41 : 1,925.55 = 553.89 : x
2. Step 2: Convert to fraction form
   1,284.41/1,925.55 = 553.89/x
3. Step 3: Cross multiply
   1,284.41x = 1,925.55 × 553.89
4. Step 4: Simplify right side
   1,284.41x = 1,066,542.89
5. Step 5: Solve for x
   x = 1,066,542.89/1,284.41
6. Step 6: Final answer
   x = 830.38