Finding the Fourth Proportional to 1,403.89, 2,106.01 and 581.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.89 : 2,106.01 = 581.72 : x
2. Step 2: Convert to fraction form
   1,403.89/2,106.01 = 581.72/x
3. Step 3: Cross multiply
   1,403.89x = 2,106.01 × 581.72
4. Step 4: Simplify right side
   1,403.89x = 1,225,108.04
5. Step 5: Solve for x
   x = 1,225,108.04/1,403.89
6. Step 6: Final answer
   x = 872.65