Finding the Fourth Proportional to 1,047.30, 1,445.25 and 581.55

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.30 : 1,445.25 = 581.55 : x
2. Step 2: Convert to fraction form
   1,047.30/1,445.25 = 581.55/x
3. Step 3: Cross multiply
   1,047.30x = 1,445.25 × 581.55
4. Step 4: Simplify right side
   1,047.30x = 840,485.14
5. Step 5: Solve for x
   x = 840,485.14/1,047.30
6. Step 6: Final answer
   x = 802.53