Finding the Fourth Proportional to 1,018.93, 1,528.39 and 288.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.93 : 1,528.39 = 288.50 : x
2. Step 2: Convert to fraction form
   1,018.93/1,528.39 = 288.50/x
3. Step 3: Cross multiply
   1,018.93x = 1,528.39 × 288.50
4. Step 4: Simplify right side
   1,018.93x = 440,941.89
5. Step 5: Solve for x
   x = 440,941.89/1,018.93
6. Step 6: Final answer
   x = 432.75