Finding the Fourth Proportional to 1,189.72, 1,781.04 and 1,064.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,189.72 : 1,781.04 = 1,064.58 : x
2. Step 2: Convert to fraction form
   1,189.72/1,781.04 = 1,064.58/x
3. Step 3: Cross multiply
   1,189.72x = 1,781.04 × 1,064.58
4. Step 4: Simplify right side
   1,189.72x = 1,896,050.89
5. Step 5: Solve for x
   x = 1,896,050.89/1,189.72
6. Step 6: Final answer
   x = 1,593.69