Finding the Fourth Proportional to 1,931.58, 2,665.80 and 1,145.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,931.58 : 2,665.80 = 1,145.61 : x
2. Step 2: Convert to fraction form
   1,931.58/2,665.80 = 1,145.61/x
3. Step 3: Cross multiply
   1,931.58x = 2,665.80 × 1,145.61
4. Step 4: Simplify right side
   1,931.58x = 3,053,967.14
5. Step 5: Solve for x
   x = 3,053,967.14/1,931.58
6. Step 6: Final answer
   x = 1,581.07