Finding the Fourth Proportional to 1,669.30, 2,499.15 and 1,021.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,669.30 : 2,499.15 = 1,021.30 : x
2. Step 2: Convert to fraction form
   1,669.30/2,499.15 = 1,021.30/x
3. Step 3: Cross multiply
   1,669.30x = 2,499.15 × 1,021.30
4. Step 4: Simplify right side
   1,669.30x = 2,552,381.90
5. Step 5: Solve for x
   x = 2,552,381.90/1,669.30
6. Step 6: Final answer
   x = 1,529.01