Finding the Fourth Proportional to 76,393.58, 105,421.50 and 42,400.08

Step by Step Solution

1. Step 1: Write the proportion equation
   76,393.58 : 105,421.50 = 42,400.08 : x
2. Step 2: Convert to fraction form
   76,393.58/105,421.50 = 42,400.08/x
3. Step 3: Cross multiply
   76,393.58x = 105,421.50 × 42,400.08
4. Step 4: Simplify right side
   76,393.58x = 4,469,880,033.72
5. Step 5: Solve for x
   x = 4,469,880,033.72/76,393.58
6. Step 6: Final answer
   x = 58,511.20