Finding the Fourth Proportional to 2,101.72, 3,152.10 and 620.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.72 : 3,152.10 = 620.56 : x
2. Step 2: Convert to fraction form
   2,101.72/3,152.10 = 620.56/x
3. Step 3: Cross multiply
   2,101.72x = 3,152.10 × 620.56
4. Step 4: Simplify right side
   2,101.72x = 1,956,067.18
5. Step 5: Solve for x
   x = 1,956,067.18/2,101.72
6. Step 6: Final answer
   x = 930.70