Finding the Fourth Proportional to 12,978.16, 19,450.32 and 5,955.64

Step by Step Solution

1. Step 1: Write the proportion equation
   12,978.16 : 19,450.32 = 5,955.64 : x
2. Step 2: Convert to fraction form
   12,978.16/19,450.32 = 5,955.64/x
3. Step 3: Cross multiply
   12,978.16x = 19,450.32 × 5,955.64
4. Step 4: Simplify right side
   12,978.16x = 115,839,103.80
5. Step 5: Solve for x
   x = 115,839,103.80/12,978.16
6. Step 6: Final answer
   x = 8,925.70