Finding the Fourth Proportional to 1,142.17, 1,576.41 and 670.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.17 : 1,576.41 = 670.09 : x
2. Step 2: Convert to fraction form
   1,142.17/1,576.41 = 670.09/x
3. Step 3: Cross multiply
   1,142.17x = 1,576.41 × 670.09
4. Step 4: Simplify right side
   1,142.17x = 1,056,336.58
5. Step 5: Solve for x
   x = 1,056,336.58/1,142.17
6. Step 6: Final answer
   x = 924.85