Finding the Fourth Proportional to 260,707.86, 391,104.17 and 80,751.25

Step by Step Solution

1. Step 1: Write the proportion equation
   260,707.86 : 391,104.17 = 80,751.25 : x
2. Step 2: Convert to fraction form
   260,707.86/391,104.17 = 80,751.25/x
3. Step 3: Cross multiply
   260,707.86x = 391,104.17 × 80,751.25
4. Step 4: Simplify right side
   260,707.86x = 31,582,150,607.71
5. Step 5: Solve for x
   x = 31,582,150,607.71/260,707.86
6. Step 6: Final answer
   x = 121,140.00