Finding the Fourth Proportional to 1,672.55, 2,307.56 and 1,042.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,672.55 : 2,307.56 = 1,042.57 : x
2. Step 2: Convert to fraction form
   1,672.55/2,307.56 = 1,042.57/x
3. Step 3: Cross multiply
   1,672.55x = 2,307.56 × 1,042.57
4. Step 4: Simplify right side
   1,672.55x = 2,405,790.50
5. Step 5: Solve for x
   x = 2,405,790.50/1,672.55
6. Step 6: Final answer
   x = 1,438.40