Finding the Fourth Proportional to 1,521.83, 2,100.98 and 991.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,521.83 : 2,100.98 = 991.19 : x
2. Step 2: Convert to fraction form
   1,521.83/2,100.98 = 991.19/x
3. Step 3: Cross multiply
   1,521.83x = 2,100.98 × 991.19
4. Step 4: Simplify right side
   1,521.83x = 2,082,454.91
5. Step 5: Solve for x
   x = 2,082,454.91/1,521.83
6. Step 6: Final answer
   x = 1,368.39