Finding the Fourth Proportional to 1,521.10, 2,100.03 and 998.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.10 : 2,100.03 = 998.04 : x
2. Step 2: Convert to fraction form
   1,521.10/2,100.03 = 998.04/x
3. Step 3: Cross multiply
   1,521.10x = 2,100.03 × 998.04
4. Step 4: Simplify right side
   1,521.10x = 2,095,913.94
5. Step 5: Solve for x
   x = 2,095,913.94/1,521.10
6. Step 6: Final answer
   x = 1,377.90