Finding the Fourth Proportional to 1,431.89, 2,145.92 and 1,178.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.89 : 2,145.92 = 1,178.45 : x
2. Step 2: Convert to fraction form
   1,431.89/2,145.92 = 1,178.45/x
3. Step 3: Cross multiply
   1,431.89x = 2,145.92 × 1,178.45
4. Step 4: Simplify right side
   1,431.89x = 2,528,853.53
5. Step 5: Solve for x
   x = 2,528,853.53/1,431.89
6. Step 6: Final answer
   x = 1,766.09