Finding the Fourth Proportional to 1,025.63, 1,528.19 and 1,021.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,025.63 : 1,528.19 = 1,021.53 : x
2. Step 2: Convert to fraction form
   1,025.63/1,528.19 = 1,021.53/x
3. Step 3: Cross multiply
   1,025.63x = 1,528.19 × 1,021.53
4. Step 4: Simplify right side
   1,025.63x = 1,561,086.82
5. Step 5: Solve for x
   x = 1,561,086.82/1,025.63
6. Step 6: Final answer
   x = 1,522.08