Finding the Fourth Proportional to 2,213.89, 3,321.35 and 753.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,213.89 : 3,321.35 = 753.05 : x
2. Step 2: Convert to fraction form
   2,213.89/3,321.35 = 753.05/x
3. Step 3: Cross multiply
   2,213.89x = 3,321.35 × 753.05
4. Step 4: Simplify right side
   2,213.89x = 2,501,135.53
5. Step 5: Solve for x
   x = 2,501,135.53/2,213.89
6. Step 6: Final answer
   x = 1,129.74