Finding the Fourth Proportional to 1,142.72, 1,577.02 and 670.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.72 : 1,577.02 = 670.62 : x
2. Step 2: Convert to fraction form
   1,142.72/1,577.02 = 670.62/x
3. Step 3: Cross multiply
   1,142.72x = 1,577.02 × 670.62
4. Step 4: Simplify right side
   1,142.72x = 1,057,581.15
5. Step 5: Solve for x
   x = 1,057,581.15/1,142.72
6. Step 6: Final answer
   x = 925.49