Finding the Fourth Proportional to 2,081.76, 3,123.18 and 620.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.76 : 3,123.18 = 620.88 : x
2. Step 2: Convert to fraction form
   2,081.76/3,123.18 = 620.88/x
3. Step 3: Cross multiply
   2,081.76x = 3,123.18 × 620.88
4. Step 4: Simplify right side
   2,081.76x = 1,939,120.00
5. Step 5: Solve for x
   x = 1,939,120.00/2,081.76
6. Step 6: Final answer
   x = 931.48