Finding the Fourth Proportional to 1,693.40, 2,538.72 and 1,042.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,693.40 : 2,538.72 = 1,042.76 : x
2. Step 2: Convert to fraction form
   1,693.40/2,538.72 = 1,042.76/x
3. Step 3: Cross multiply
   1,693.40x = 2,538.72 × 1,042.76
4. Step 4: Simplify right side
   1,693.40x = 2,647,282.01
5. Step 5: Solve for x
   x = 2,647,282.01/1,693.40
6. Step 6: Final answer
   x = 1,563.30