Finding the Fourth Proportional to 2,561.50, 3,841.80 and 918.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.50 : 3,841.80 = 918.10 : x
2. Step 2: Convert to fraction form
   2,561.50/3,841.80 = 918.10/x
3. Step 3: Cross multiply
   2,561.50x = 3,841.80 × 918.10
4. Step 4: Simplify right side
   2,561.50x = 3,527,156.58
5. Step 5: Solve for x
   x = 3,527,156.58/2,561.50
6. Step 6: Final answer
   x = 1,376.99