Finding the Fourth Proportional to 2,128.47, 3,190.01 and 1,512.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,128.47 : 3,190.01 = 1,512.31 : x
2. Step 2: Convert to fraction form
   2,128.47/3,190.01 = 1,512.31/x
3. Step 3: Cross multiply
   2,128.47x = 3,190.01 × 1,512.31
4. Step 4: Simplify right side
   2,128.47x = 4,824,284.02
5. Step 5: Solve for x
   x = 4,824,284.02/2,128.47
6. Step 6: Final answer
   x = 2,266.55