Finding the Fourth Proportional to 76,400.82, 105,430.41 and 42,410.79

Step by Step Solution

1. Step 1: Write the proportion equation
   76,400.82 : 105,430.41 = 42,410.79 : x
2. Step 2: Convert to fraction form
   76,400.82/105,430.41 = 42,410.79/x
3. Step 3: Cross multiply
   76,400.82x = 105,430.41 × 42,410.79
4. Step 4: Simplify right side
   76,400.82x = 4,471,386,978.12
5. Step 5: Solve for x
   x = 4,471,386,978.12/76,400.82
6. Step 6: Final answer
   x = 58,525.38