Finding the Fourth Proportional to 8,978.68, 13,468.50 and 3,431

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.68 : 13,468.50 = 3,431 : x
2. Step 2: Convert to fraction form
   8,978.68/13,468.50 = 3,431/x
3. Step 3: Cross multiply
   8,978.68x = 13,468.50 × 3,431
4. Step 4: Simplify right side
   8,978.68x = 46,210,423.50
5. Step 5: Solve for x
   x = 46,210,423.50/8,978.68
6. Step 6: Final answer
   x = 5,146.68