Finding the Fourth Proportional to 1,581.59, 2,373.20 and 851.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,581.59 : 2,373.20 = 851.87 : x
2. Step 2: Convert to fraction form
   1,581.59/2,373.20 = 851.87/x
3. Step 3: Cross multiply
   1,581.59x = 2,373.20 × 851.87
4. Step 4: Simplify right side
   1,581.59x = 2,021,653.62
5. Step 5: Solve for x
   x = 2,021,653.62/1,581.59
6. Step 6: Final answer
   x = 1,278.24