Finding the Fourth Proportional to 60,439.50, 90,215.58 and 55,986.23

Step by Step Solution

1. Step 1: Write the proportion equation
   60,439.50 : 90,215.58 = 55,986.23 : x
2. Step 2: Convert to fraction form
   60,439.50/90,215.58 = 55,986.23/x
3. Step 3: Cross multiply
   60,439.50x = 90,215.58 × 55,986.23
4. Step 4: Simplify right side
   60,439.50x = 5,050,829,760.39
5. Step 5: Solve for x
   x = 5,050,829,760.39/60,439.50
6. Step 6: Final answer
   x = 83,568.36