Finding the Fourth Proportional to 1,017.50, 1,526.31 and 287.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,017.50 : 1,526.31 = 287.01 : x
2. Step 2: Convert to fraction form
   1,017.50/1,526.31 = 287.01/x
3. Step 3: Cross multiply
   1,017.50x = 1,526.31 × 287.01
4. Step 4: Simplify right side
   1,017.50x = 438,066.23
5. Step 5: Solve for x
   x = 438,066.23/1,017.50
6. Step 6: Final answer
   x = 430.53