Finding the Fourth Proportional to 261,166.80, 391,799.37 and 186,100.72

Step by Step Solution

1. Step 1: Write the proportion equation
   261,166.80 : 391,799.37 = 186,100.72 : x
2. Step 2: Convert to fraction form
   261,166.80/391,799.37 = 186,100.72/x
3. Step 3: Cross multiply
   261,166.80x = 391,799.37 × 186,100.72
4. Step 4: Simplify right side
   261,166.80x = 72,914,143,922.04
5. Step 5: Solve for x
   x = 72,914,143,922.04/261,166.80
6. Step 6: Final answer
   x = 279,186.12