Finding the Fourth Proportional to 191,185.45, 286,610.49 and 72,778.03

Step by Step Solution

1. Step 1: Write the proportion equation
   191,185.45 : 286,610.49 = 72,778.03 : x
2. Step 2: Convert to fraction form
   191,185.45/286,610.49 = 72,778.03/x
3. Step 3: Cross multiply
   191,185.45x = 286,610.49 × 72,778.03
4. Step 4: Simplify right side
   191,185.45x = 20,858,946,123.01
5. Step 5: Solve for x
   x = 20,858,946,123.01/191,185.45
6. Step 6: Final answer
   x = 109,103.21