Finding the Fourth Proportional to 1,551.88, 2,141.59 and 853.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,551.88 : 2,141.59 = 853.30 : x
2. Step 2: Convert to fraction form
   1,551.88/2,141.59 = 853.30/x
3. Step 3: Cross multiply
   1,551.88x = 2,141.59 × 853.30
4. Step 4: Simplify right side
   1,551.88x = 1,827,418.75
5. Step 5: Solve for x
   x = 1,827,418.75/1,551.88
6. Step 6: Final answer
   x = 1,177.55