Finding the Fourth Proportional to 1,530.21, 2,111.63 and 940.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,530.21 : 2,111.63 = 940.53 : x
2. Step 2: Convert to fraction form
   1,530.21/2,111.63 = 940.53/x
3. Step 3: Cross multiply
   1,530.21x = 2,111.63 × 940.53
4. Step 4: Simplify right side
   1,530.21x = 1,986,046.66
5. Step 5: Solve for x
   x = 1,986,046.66/1,530.21
6. Step 6: Final answer
   x = 1,297.89