Finding the Fourth Proportional to 1,776.30, 2,451.15 and 990.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,776.30 : 2,451.15 = 990.18 : x
2. Step 2: Convert to fraction form
   1,776.30/2,451.15 = 990.18/x
3. Step 3: Cross multiply
   1,776.30x = 2,451.15 × 990.18
4. Step 4: Simplify right side
   1,776.30x = 2,427,079.71
5. Step 5: Solve for x
   x = 2,427,079.71/1,776.30
6. Step 6: Final answer
   x = 1,366.37