Finding the Fourth Proportional to 8,972.78, 12,381.54 and 5,435.78

Step by Step Solution

1. Step 1: Write the proportion equation
   8,972.78 : 12,381.54 = 5,435.78 : x
2. Step 2: Convert to fraction form
   8,972.78/12,381.54 = 5,435.78/x
3. Step 3: Cross multiply
   8,972.78x = 12,381.54 × 5,435.78
4. Step 4: Simplify right side
   8,972.78x = 67,303,327.50
5. Step 5: Solve for x
   x = 67,303,327.50/8,972.78
6. Step 6: Final answer
   x = 7,500.83