Finding the Fourth Proportional to 58,429.76, 80,643.20 and 56,485.76

Step by Step Solution

1. Step 1: Write the proportion equation
   58,429.76 : 80,643.20 = 56,485.76 : x
2. Step 2: Convert to fraction form
   58,429.76/80,643.20 = 56,485.76/x
3. Step 3: Cross multiply
   58,429.76x = 80,643.20 × 56,485.76
4. Step 4: Simplify right side
   58,429.76x = 4,555,192,440.83
5. Step 5: Solve for x
   x = 4,555,192,440.83/58,429.76
6. Step 6: Final answer
   x = 77,960.14