Finding the Fourth Proportional to 1,145.01, 1,578.62 and 1,129.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.01 : 1,578.62 = 1,129.52 : x
2. Step 2: Convert to fraction form
   1,145.01/1,578.62 = 1,129.52/x
3. Step 3: Cross multiply
   1,145.01x = 1,578.62 × 1,129.52
4. Step 4: Simplify right side
   1,145.01x = 1,783,069.32
5. Step 5: Solve for x
   x = 1,783,069.32/1,145.01
6. Step 6: Final answer
   x = 1,557.26