Finding the Fourth Proportional to 1,145.70, 1,577.61 and 1,081.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.70 : 1,577.61 = 1,081.62 : x
2. Step 2: Convert to fraction form
   1,145.70/1,577.61 = 1,081.62/x
3. Step 3: Cross multiply
   1,145.70x = 1,577.61 × 1,081.62
4. Step 4: Simplify right side
   1,145.70x = 1,706,374.53
5. Step 5: Solve for x
   x = 1,706,374.53/1,145.70
6. Step 6: Final answer
   x = 1,489.37