Finding the Fourth Proportional to 1,641.69, 2,461.06 and 1,057.13

Step by Step Solution

1. Step 1: Write the proportion equation
   1,641.69 : 2,461.06 = 1,057.13 : x
2. Step 2: Convert to fraction form
   1,641.69/2,461.06 = 1,057.13/x
3. Step 3: Cross multiply
   1,641.69x = 2,461.06 × 1,057.13
4. Step 4: Simplify right side
   1,641.69x = 2,601,648.71
5. Step 5: Solve for x
   x = 2,601,648.71/1,641.69
6. Step 6: Final answer
   x = 1,584.74