Finding the Fourth Proportional to 1,620.48, 2,429.44 and 1,445.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,620.48 : 2,429.44 = 1,445.12 : x
2. Step 2: Convert to fraction form
   1,620.48/2,429.44 = 1,445.12/x
3. Step 3: Cross multiply
   1,620.48x = 2,429.44 × 1,445.12
4. Step 4: Simplify right side
   1,620.48x = 3,510,832.33
5. Step 5: Solve for x
   x = 3,510,832.33/1,620.48
6. Step 6: Final answer
   x = 2,166.54