Finding the Fourth Proportional to 1,776.10, 2,450.98 and 990.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,776.10 : 2,450.98 = 990.10 : x
2. Step 2: Convert to fraction form
   1,776.10/2,450.98 = 990.10/x
3. Step 3: Cross multiply
   1,776.10x = 2,450.98 × 990.10
4. Step 4: Simplify right side
   1,776.10x = 2,426,715.30
5. Step 5: Solve for x
   x = 2,426,715.30/1,776.10
6. Step 6: Final answer
   x = 1,366.32