Finding the Fourth Proportional to 1,638.08, 2,458.56 and 1,061.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.08 : 2,458.56 = 1,061.60 : x
2. Step 2: Convert to fraction form
   1,638.08/2,458.56 = 1,061.60/x
3. Step 3: Cross multiply
   1,638.08x = 2,458.56 × 1,061.60
4. Step 4: Simplify right side
   1,638.08x = 2,610,007.30
5. Step 5: Solve for x
   x = 2,610,007.30/1,638.08
6. Step 6: Final answer
   x = 1,593.33