Finding the Fourth Proportional to 2,605.90, 3,909.58 and 1,047.00

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.90 : 3,909.58 = 1,047.00 : x
2. Step 2: Convert to fraction form
   2,605.90/3,909.58 = 1,047.00/x
3. Step 3: Cross multiply
   2,605.90x = 3,909.58 × 1,047.00
4. Step 4: Simplify right side
   2,605.90x = 4,093,309.32
5. Step 5: Solve for x
   x = 4,093,309.32/2,605.90
6. Step 6: Final answer
   x = 1,570.79