Finding the Fourth Proportional to 78,196.47, 107,973.23 and 72,225.96

Step by Step Solution

1. Step 1: Write the proportion equation
   78,196.47 : 107,973.23 = 72,225.96 : x
2. Step 2: Convert to fraction form
   78,196.47/107,973.23 = 72,225.96/x
3. Step 3: Cross multiply
   78,196.47x = 107,973.23 × 72,225.96
4. Step 4: Simplify right side
   78,196.47x = 7,798,470,191.05
5. Step 5: Solve for x
   x = 7,798,470,191.05/78,196.47
6. Step 6: Final answer
   x = 99,729.18