Finding the Fourth Proportional to 1,145.10, 1,580.00 and 672.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,145.10 : 1,580.00 = 672.87 : x
2. Step 2: Convert to fraction form
   1,145.10/1,580.00 = 672.87/x
3. Step 3: Cross multiply
   1,145.10x = 1,580.00 × 672.87
4. Step 4: Simplify right side
   1,145.10x = 1,063,131.24
5. Step 5: Solve for x
   x = 1,063,131.24/1,145.10
6. Step 6: Final answer
   x = 928.42