Finding the Fourth Proportional to 2,990.67, 4,484.28 and 910.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,990.67 : 4,484.28 = 910.05 : x
2. Step 2: Convert to fraction form
   2,990.67/4,484.28 = 910.05/x
3. Step 3: Cross multiply
   2,990.67x = 4,484.28 × 910.05
4. Step 4: Simplify right side
   2,990.67x = 4,080,925.72
5. Step 5: Solve for x
   x = 4,080,925.72/2,990.67
6. Step 6: Final answer
   x = 1,364.55