Finding the Fourth Proportional to 1,142.64, 1,576.71 and 670.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.64 : 1,576.71 = 670.55 : x
2. Step 2: Convert to fraction form
   1,142.64/1,576.71 = 670.55/x
3. Step 3: Cross multiply
   1,142.64x = 1,576.71 × 670.55
4. Step 4: Simplify right side
   1,142.64x = 1,057,255.01
5. Step 5: Solve for x
   x = 1,057,255.01/1,142.64
6. Step 6: Final answer
   x = 925.27