Finding the Fourth Proportional to 2,350.86, 3,526.69 and 811.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,350.86 : 3,526.69 = 811.50 : x
2. Step 2: Convert to fraction form
   2,350.86/3,526.69 = 811.50/x
3. Step 3: Cross multiply
   2,350.86x = 3,526.69 × 811.50
4. Step 4: Simplify right side
   2,350.86x = 2,861,908.94
5. Step 5: Solve for x
   x = 2,861,908.94/2,350.86
6. Step 6: Final answer
   x = 1,217.39