Finding the Fourth Proportional to 1,899.46, 2,620.50 and 1,153.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,899.46 : 2,620.50 = 1,153.15 : x
2. Step 2: Convert to fraction form
   1,899.46/2,620.50 = 1,153.15/x
3. Step 3: Cross multiply
   1,899.46x = 2,620.50 × 1,153.15
4. Step 4: Simplify right side
   1,899.46x = 3,021,829.58
5. Step 5: Solve for x
   x = 3,021,829.58/1,899.46
6. Step 6: Final answer
   x = 1,590.89