Finding the Fourth Proportional to 78,196.22, 107,972.88 and 72,225.70

Step by Step Solution

1. Step 1: Write the proportion equation
   78,196.22 : 107,972.88 = 72,225.70 : x
2. Step 2: Convert to fraction form
   78,196.22/107,972.88 = 72,225.70/x
3. Step 3: Cross multiply
   78,196.22x = 107,972.88 × 72,225.70
4. Step 4: Simplify right side
   78,196.22x = 7,798,416,839.02
5. Step 5: Solve for x
   x = 7,798,416,839.02/78,196.22
6. Step 6: Final answer
   x = 99,728.82