Finding the Fourth Proportional to 1,045.30, 1,442.50 and 579.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,045.30 : 1,442.50 = 579.55 : x
2. Step 2: Convert to fraction form
   1,045.30/1,442.50 = 579.55/x
3. Step 3: Cross multiply
   1,045.30x = 1,442.50 × 579.55
4. Step 4: Simplify right side
   1,045.30x = 836,000.88
5. Step 5: Solve for x
   x = 836,000.88/1,045.30
6. Step 6: Final answer
   x = 799.77