Finding the Fourth Proportional to 78,196.72, 107,973.59 and 72,226.21

Step by Step Solution

1. Step 1: Write the proportion equation
   78,196.72 : 107,973.59 = 72,226.21 : x
2. Step 2: Convert to fraction form
   78,196.72/107,973.59 = 72,226.21/x
3. Step 3: Cross multiply
   78,196.72x = 107,973.59 × 72,226.21
4. Step 4: Simplify right side
   78,196.72x = 7,798,523,185.79
5. Step 5: Solve for x
   x = 7,798,523,185.79/78,196.72
6. Step 6: Final answer
   x = 99,729.54