Finding the Fourth Proportional to 76,451.50, 105,503.13 and 42,928.30

Step by Step Solution

1. Step 1: Write the proportion equation
   76,451.50 : 105,503.13 = 42,928.30 : x
2. Step 2: Convert to fraction form
   76,451.50/105,503.13 = 42,928.30/x
3. Step 3: Cross multiply
   76,451.50x = 105,503.13 × 42,928.30
4. Step 4: Simplify right side
   76,451.50x = 4,529,070,015.58
5. Step 5: Solve for x
   x = 4,529,070,015.58/76,451.50
6. Step 6: Final answer
   x = 59,241.09