Finding the Fourth Proportional to 76,554.54, 105,615.77 and 56,459.05

Step by Step Solution

1. Step 1: Write the proportion equation
   76,554.54 : 105,615.77 = 56,459.05 : x
2. Step 2: Convert to fraction form
   76,554.54/105,615.77 = 56,459.05/x
3. Step 3: Cross multiply
   76,554.54x = 105,615.77 × 56,459.05
4. Step 4: Simplify right side
   76,554.54x = 5,962,965,492.88
5. Step 5: Solve for x
   x = 5,962,965,492.88/76,554.54
6. Step 6: Final answer
   x = 77,891.73