Finding the Fourth Proportional to 260,910.56, 391,359.68 and 83,419.10

Step by Step Solution

1. Step 1: Write the proportion equation
   260,910.56 : 391,359.68 = 83,419.10 : x
2. Step 2: Convert to fraction form
   260,910.56/391,359.68 = 83,419.10/x
3. Step 3: Cross multiply
   260,910.56x = 391,359.68 × 83,419.10
4. Step 4: Simplify right side
   260,910.56x = 32,646,872,281.89
5. Step 5: Solve for x
   x = 32,646,872,281.89/260,910.56
6. Step 6: Final answer
   x = 125,126.68