Finding the Fourth Proportional to 1,665.57, 2,498.12 and 1,047.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,665.57 : 2,498.12 = 1,047.39 : x
2. Step 2: Convert to fraction form
   1,665.57/2,498.12 = 1,047.39/x
3. Step 3: Cross multiply
   1,665.57x = 2,498.12 × 1,047.39
4. Step 4: Simplify right side
   1,665.57x = 2,616,505.91
5. Step 5: Solve for x
   x = 2,616,505.91/1,665.57
6. Step 6: Final answer
   x = 1,570.94