Finding the Fourth Proportional to 76,379.85, 105,405.31 and 42,390.53

Step by Step Solution

1. Step 1: Write the proportion equation
   76,379.85 : 105,405.31 = 42,390.53 : x
2. Step 2: Convert to fraction form
   76,379.85/105,405.31 = 42,390.53/x
3. Step 3: Cross multiply
   76,379.85x = 105,405.31 × 42,390.53
4. Step 4: Simplify right side
   76,379.85x = 4,468,186,955.71
5. Step 5: Solve for x
   x = 4,468,186,955.71/76,379.85
6. Step 6: Final answer
   x = 58,499.55