Finding the Fourth Proportional to 86,456.07, 129,699.77 and 42,082.79

Step by Step Solution

1. Step 1: Write the proportion equation
   86,456.07 : 129,699.77 = 42,082.79 : x
2. Step 2: Convert to fraction form
   86,456.07/129,699.77 = 42,082.79/x
3. Step 3: Cross multiply
   86,456.07x = 129,699.77 × 42,082.79
4. Step 4: Simplify right side
   86,456.07x = 5,458,127,325.05
5. Step 5: Solve for x
   x = 5,458,127,325.05/86,456.07
6. Step 6: Final answer
   x = 63,131.80