Finding the Fourth Proportional to 65,089.82, 89,889.45 and 56,086.94

Step by Step Solution

1. Step 1: Write the proportion equation
   65,089.82 : 89,889.45 = 56,086.94 : x
2. Step 2: Convert to fraction form
   65,089.82/89,889.45 = 56,086.94/x
3. Step 3: Cross multiply
   65,089.82x = 89,889.45 × 56,086.94
4. Step 4: Simplify right side
   65,089.82x = 5,041,624,188.78
5. Step 5: Solve for x
   x = 5,041,624,188.78/65,089.82
6. Step 6: Final answer
   x = 77,456.42