Finding the Fourth Proportional to 1,553.47, 2,143.61 and 890.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,553.47 : 2,143.61 = 890.29 : x
2. Step 2: Convert to fraction form
   1,553.47/2,143.61 = 890.29/x
3. Step 3: Cross multiply
   1,553.47x = 2,143.61 × 890.29
4. Step 4: Simplify right side
   1,553.47x = 1,908,434.55
5. Step 5: Solve for x
   x = 1,908,434.55/1,553.47
6. Step 6: Final answer
   x = 1,228.50