Finding the Fourth Proportional to 2,075.56, 3,111.18 and 921.64

Step by Step Solution

1. Step 1: Write the proportion equation
   2,075.56 : 3,111.18 = 921.64 : x
2. Step 2: Convert to fraction form
   2,075.56/3,111.18 = 921.64/x
3. Step 3: Cross multiply
   2,075.56x = 3,111.18 × 921.64
4. Step 4: Simplify right side
   2,075.56x = 2,867,387.94
5. Step 5: Solve for x
   x = 2,867,387.94/2,075.56
6. Step 6: Final answer
   x = 1,381.50