Finding the Fourth Proportional to 8,955.90, 12,360.71 and 5,178.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,955.90 : 12,360.71 = 5,178.47 : x
2. Step 2: Convert to fraction form
   8,955.90/12,360.71 = 5,178.47/x
3. Step 3: Cross multiply
   8,955.90x = 12,360.71 × 5,178.47
4. Step 4: Simplify right side
   8,955.90x = 64,009,517.06
5. Step 5: Solve for x
   x = 64,009,517.06/8,955.90
6. Step 6: Final answer
   x = 7,147.19