Finding the Fourth Proportional to 1,553.50, 2,143.98 and 855.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.50 : 2,143.98 = 855.01 : x
2. Step 2: Convert to fraction form
   1,553.50/2,143.98 = 855.01/x
3. Step 3: Cross multiply
   1,553.50x = 2,143.98 × 855.01
4. Step 4: Simplify right side
   1,553.50x = 1,833,124.34
5. Step 5: Solve for x
   x = 1,833,124.34/1,553.50
6. Step 6: Final answer
   x = 1,180.00