Finding the Fourth Proportional to 1,096.79, 1,643.45 and 402.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,096.79 : 1,643.45 = 402.50 : x
2. Step 2: Convert to fraction form
   1,096.79/1,643.45 = 402.50/x
3. Step 3: Cross multiply
   1,096.79x = 1,643.45 × 402.50
4. Step 4: Simplify right side
   1,096.79x = 661,493.32
5. Step 5: Solve for x
   x = 661,493.32/1,096.79
6. Step 6: Final answer
   x = 603.12