Finding the Fourth Proportional to 2,101.85, 3,152.76 and 641.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,101.85 : 3,152.76 = 641.01 : x
2. Step 2: Convert to fraction form
   2,101.85/3,152.76 = 641.01/x
3. Step 3: Cross multiply
   2,101.85x = 3,152.76 × 641.01
4. Step 4: Simplify right side
   2,101.85x = 2,020,950.69
5. Step 5: Solve for x
   x = 2,020,950.69/2,101.85
6. Step 6: Final answer
   x = 961.51