Finding the Fourth Proportional to 1,178.30, 1,626.24 and 1,139.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,178.30 : 1,626.24 = 1,139.93 : x
2. Step 2: Convert to fraction form
   1,178.30/1,626.24 = 1,139.93/x
3. Step 3: Cross multiply
   1,178.30x = 1,626.24 × 1,139.93
4. Step 4: Simplify right side
   1,178.30x = 1,853,799.76
5. Step 5: Solve for x
   x = 1,853,799.76/1,178.30
6. Step 6: Final answer
   x = 1,573.28