Finding the Fourth Proportional to 1,542.89, 2,128.53 and 945.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,542.89 : 2,128.53 = 945.15 : x
2. Step 2: Convert to fraction form
   1,542.89/2,128.53 = 945.15/x
3. Step 3: Cross multiply
   1,542.89x = 2,128.53 × 945.15
4. Step 4: Simplify right side
   1,542.89x = 2,011,780.13
5. Step 5: Solve for x
   x = 2,011,780.13/1,542.89
6. Step 6: Final answer
   x = 1,303.90