Finding the Fourth Proportional to 76,419.86, 105,460.65 and 42,430.54

Step by Step Solution

1. Step 1: Write the proportion equation
   76,419.86 : 105,460.65 = 42,430.54 : x
2. Step 2: Convert to fraction form
   76,419.86/105,460.65 = 42,430.54/x
3. Step 3: Cross multiply
   76,419.86x = 105,460.65 × 42,430.54
4. Step 4: Simplify right side
   76,419.86x = 4,474,752,262.34
5. Step 5: Solve for x
   x = 4,474,752,262.34/76,419.86
6. Step 6: Final answer
   x = 58,554.83