Finding the Fourth Proportional to 1,143.02, 1,577.40 and 670.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,143.02 : 1,577.40 = 670.99 : x
2. Step 2: Convert to fraction form
   1,143.02/1,577.40 = 670.99/x
3. Step 3: Cross multiply
   1,143.02x = 1,577.40 × 670.99
4. Step 4: Simplify right side
   1,143.02x = 1,058,419.63
5. Step 5: Solve for x
   x = 1,058,419.63/1,143.02
6. Step 6: Final answer
   x = 925.99