Finding the Fourth Proportional to 131,816, 181,906.72 and 72,200

Step by Step Solution

1. Step 1: Write the proportion equation
   131,816 : 181,906.72 = 72,200 : x
2. Step 2: Convert to fraction form
   131,816/181,906.72 = 72,200/x
3. Step 3: Cross multiply
   131,816x = 181,906.72 × 72,200
4. Step 4: Simplify right side
   131,816x = 13,133,665,184
5. Step 5: Solve for x
   x = 13,133,665,184/131,816
6. Step 6: Final answer
   x = 99,636.35