Finding the Fourth Proportional to 8,978.98, 13,460.14 and 3,978.70

Step by Step Solution

1. Step 1: Write the proportion equation
   8,978.98 : 13,460.14 = 3,978.70 : x
2. Step 2: Convert to fraction form
   8,978.98/13,460.14 = 3,978.70/x
3. Step 3: Cross multiply
   8,978.98x = 13,460.14 × 3,978.70
4. Step 4: Simplify right side
   8,978.98x = 53,553,859.02
5. Step 5: Solve for x
   x = 53,553,859.02/8,978.98
6. Step 6: Final answer
   x = 5,964.36