Finding the Fourth Proportional to 58,433.76, 80,648.72 and 56,489.76

Step by Step Solution

1. Step 1: Write the proportion equation
   58,433.76 : 80,648.72 = 56,489.76 : x
2. Step 2: Convert to fraction form
   58,433.76/80,648.72 = 56,489.76/x
3. Step 3: Cross multiply
   58,433.76x = 80,648.72 × 56,489.76
4. Step 4: Simplify right side
   58,433.76x = 4,555,826,837.11
5. Step 5: Solve for x
   x = 4,555,826,837.11/58,433.76
6. Step 6: Final answer
   x = 77,965.66