Finding the Fourth Proportional to 2,072.76, 3,109.88 and 977.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.76 : 3,109.88 = 977.28 : x
2. Step 2: Convert to fraction form
   2,072.76/3,109.88 = 977.28/x
3. Step 3: Cross multiply
   2,072.76x = 3,109.88 × 977.28
4. Step 4: Simplify right side
   2,072.76x = 3,039,223.53
5. Step 5: Solve for x
   x = 3,039,223.53/2,072.76
6. Step 6: Final answer
   x = 1,466.27