Finding the Fourth Proportional to 1,591.42, 2,387.52 and 859.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.42 : 2,387.52 = 859.98 : x
2. Step 2: Convert to fraction form
   1,591.42/2,387.52 = 859.98/x
3. Step 3: Cross multiply
   1,591.42x = 2,387.52 × 859.98
4. Step 4: Simplify right side
   1,591.42x = 2,053,219.45
5. Step 5: Solve for x
   x = 2,053,219.45/1,591.42
6. Step 6: Final answer
   x = 1,290.18