Finding the Fourth Proportional to 1,018.63, 1,526.56 and 432.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,018.63 : 1,526.56 = 432.89 : x
2. Step 2: Convert to fraction form
   1,018.63/1,526.56 = 432.89/x
3. Step 3: Cross multiply
   1,018.63x = 1,526.56 × 432.89
4. Step 4: Simplify right side
   1,018.63x = 660,838.15
5. Step 5: Solve for x
   x = 660,838.15/1,018.63
6. Step 6: Final answer
   x = 648.75