Finding the Fourth Proportional to 1,899.20, 2,620.50 and 1,153.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.20 : 2,620.50 = 1,153.56 : x
2. Step 2: Convert to fraction form
   1,899.20/2,620.50 = 1,153.56/x
3. Step 3: Cross multiply
   1,899.20x = 2,620.50 × 1,153.56
4. Step 4: Simplify right side
   1,899.20x = 3,022,903.98
5. Step 5: Solve for x
   x = 3,022,903.98/1,899.20
6. Step 6: Final answer
   x = 1,591.67