Finding the Fourth Proportional to 76,421.36, 105,462.72 and 42,432.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76,421.36 : 105,462.72 = 42,432.05 : x
2. Step 2: Convert to fraction form
   76,421.36/105,462.72 = 42,432.05/x
3. Step 3: Cross multiply
   76,421.36x = 105,462.72 × 42,432.05
4. Step 4: Simplify right side
   76,421.36x = 4,474,998,880.86
5. Step 5: Solve for x
   x = 4,474,998,880.86/76,421.36
6. Step 6: Final answer
   x = 58,556.92