Finding the Fourth Proportional to 142,584.48, 213,756.42 and 89,877.78

Step by Step Solution

1. Step 1: Write the proportion equation
   142,584.48 : 213,756.42 = 89,877.78 : x
2. Step 2: Convert to fraction form
   142,584.48/213,756.42 = 89,877.78/x
3. Step 3: Cross multiply
   142,584.48x = 213,756.42 × 89,877.78
4. Step 4: Simplify right side
   142,584.48x = 19,211,952,490.35
5. Step 5: Solve for x
   x = 19,211,952,490.35/142,584.48
6. Step 6: Final answer
   x = 134,740.84