Finding the Fourth Proportional to 2,123.12, 2,931.22 and 1,901.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,123.12 : 2,931.22 = 1,901.68 : x
2. Step 2: Convert to fraction form
   2,123.12/2,931.22 = 1,901.68/x
3. Step 3: Cross multiply
   2,123.12x = 2,931.22 × 1,901.68
4. Step 4: Simplify right side
   2,123.12x = 5,574,242.45
5. Step 5: Solve for x
   x = 5,574,242.45/2,123.12
6. Step 6: Final answer
   x = 2,625.50