Finding the Fourth Proportional to 2,662.50, 3,994.38 and 813.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,662.50 : 3,994.38 = 813.88 : x
2. Step 2: Convert to fraction form
   2,662.50/3,994.38 = 813.88/x
3. Step 3: Cross multiply
   2,662.50x = 3,994.38 × 813.88
4. Step 4: Simplify right side
   2,662.50x = 3,250,950.99
5. Step 5: Solve for x
   x = 3,250,950.99/2,662.50
6. Step 6: Final answer
   x = 1,221.01