Finding the Fourth Proportional to 2,139.83, 3,209.54 and 753.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.83 : 3,209.54 = 753.05 : x
2. Step 2: Convert to fraction form
   2,139.83/3,209.54 = 753.05/x
3. Step 3: Cross multiply
   2,139.83x = 3,209.54 × 753.05
4. Step 4: Simplify right side
   2,139.83x = 2,416,928.05
5. Step 5: Solve for x
   x = 2,416,928.05/2,139.83
6. Step 6: Final answer
   x = 1,129.50