Finding the Fourth Proportional to 1,142.94, 1,577.16 and 670.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,142.94 : 1,577.16 = 670.86 : x
2. Step 2: Convert to fraction form
   1,142.94/1,577.16 = 670.86/x
3. Step 3: Cross multiply
   1,142.94x = 1,577.16 × 670.86
4. Step 4: Simplify right side
   1,142.94x = 1,058,053.56
5. Step 5: Solve for x
   x = 1,058,053.56/1,142.94
6. Step 6: Final answer
   x = 925.73