Finding the Fourth Proportional to 103,673.50, 143,086.71 and 78,479.26

Step by Step Solution

1. Step 1: Write the proportion equation
   103,673.50 : 143,086.71 = 78,479.26 : x
2. Step 2: Convert to fraction form
   103,673.50/143,086.71 = 78,479.26/x
3. Step 3: Cross multiply
   103,673.50x = 143,086.71 × 78,479.26
4. Step 4: Simplify right side
   103,673.50x = 11,229,339,116.63
5. Step 5: Solve for x
   x = 11,229,339,116.63/103,673.50
6. Step 6: Final answer
   x = 108,314.46