Finding the Fourth Proportional to 120,713.63, 166,584.80 and 78,272.46

Step by Step Solution

1. Step 1: Write the proportion equation
   120,713.63 : 166,584.80 = 78,272.46 : x
2. Step 2: Convert to fraction form
   120,713.63/166,584.80 = 78,272.46/x
3. Step 3: Cross multiply
   120,713.63x = 166,584.80 × 78,272.46
4. Step 4: Simplify right side
   120,713.63x = 13,039,002,290.29
5. Step 5: Solve for x
   x = 13,039,002,290.29/120,713.63
6. Step 6: Final answer
   x = 108,015.99