Finding the Fourth Proportional to 1,900.78, 2,622.81 and 1,528.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,900.78 : 2,622.81 = 1,528.90 : x
2. Step 2: Convert to fraction form
   1,900.78/2,622.81 = 1,528.90/x
3. Step 3: Cross multiply
   1,900.78x = 2,622.81 × 1,528.90
4. Step 4: Simplify right side
   1,900.78x = 4,010,014.21
5. Step 5: Solve for x
   x = 4,010,014.21/1,900.78
6. Step 6: Final answer
   x = 2,109.67