Finding the Fourth Proportional to 260,071.20, 390,123.82 and 80,134.56

Step by Step Solution

1. Step 1: Write the proportion equation
   260,071.20 : 390,123.82 = 80,134.56 : x
2. Step 2: Convert to fraction form
   260,071.20/390,123.82 = 80,134.56/x
3. Step 3: Cross multiply
   260,071.20x = 390,123.82 × 80,134.56
4. Step 4: Simplify right side
   260,071.20x = 31,262,401,235.86
5. Step 5: Solve for x
   x = 31,262,401,235.86/260,071.20
6. Step 6: Final answer
   x = 120,207.09