Finding the Fourth Proportional to 1,591.99, 2,385.55 and 810.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,591.99 : 2,385.55 = 810.82 : x
2. Step 2: Convert to fraction form
   1,591.99/2,385.55 = 810.82/x
3. Step 3: Cross multiply
   1,591.99x = 2,385.55 × 810.82
4. Step 4: Simplify right side
   1,591.99x = 1,934,247.60
5. Step 5: Solve for x
   x = 1,934,247.60/1,591.99
6. Step 6: Final answer
   x = 1,214.99