Finding the Fourth Proportional to 787.50, 1,086.76 and 438.18

Step by Step Solution

1. Step 1: Write the proportion equation
   787.50 : 1,086.76 = 438.18 : x
2. Step 2: Convert to fraction form
   787.50/1,086.76 = 438.18/x
3. Step 3: Cross multiply
   787.50x = 1,086.76 × 438.18
4. Step 4: Simplify right side
   787.50x = 476,196.50
5. Step 5: Solve for x
   x = 476,196.50/787.50
6. Step 6: Final answer
   x = 604.69