Finding the Fourth Proportional to 2,210.77, 3,314.94 and 911.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,210.77 : 3,314.94 = 911.53 : x
2. Step 2: Convert to fraction form
   2,210.77/3,314.94 = 911.53/x
3. Step 3: Cross multiply
   2,210.77x = 3,314.94 × 911.53
4. Step 4: Simplify right side
   2,210.77x = 3,021,667.26
5. Step 5: Solve for x
   x = 3,021,667.26/2,210.77
6. Step 6: Final answer
   x = 1,366.79