Finding the Fourth Proportional to 89,870.40, 134,854.20 and 39,958.20

Step by Step Solution

1. Step 1: Write the proportion equation
   89,870.40 : 134,854.20 = 39,958.20 : x
2. Step 2: Convert to fraction form
   89,870.40/134,854.20 = 39,958.20/x
3. Step 3: Cross multiply
   89,870.40x = 134,854.20 × 39,958.20
4. Step 4: Simplify right side
   89,870.40x = 5,388,531,094.44
5. Step 5: Solve for x
   x = 5,388,531,094.44/89,870.40
6. Step 6: Final answer
   x = 59,958.91