Finding the Fourth Proportional to 1,047.47, 1,445.52 and 581.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,047.47 : 1,445.52 = 581.72 : x
2. Step 2: Convert to fraction form
   1,047.47/1,445.52 = 581.72/x
3. Step 3: Cross multiply
   1,047.47x = 1,445.52 × 581.72
4. Step 4: Simplify right side
   1,047.47x = 840,887.89
5. Step 5: Solve for x
   x = 840,887.89/1,047.47
6. Step 6: Final answer
   x = 802.78