Finding the Fourth Proportional to 136,290.42, 204,348.15 and 89,488.62

Step by Step Solution

1. Step 1: Write the proportion equation
   136,290.42 : 204,348.15 = 89,488.62 : x
2. Step 2: Convert to fraction form
   136,290.42/204,348.15 = 89,488.62/x
3. Step 3: Cross multiply
   136,290.42x = 204,348.15 × 89,488.62
4. Step 4: Simplify right side
   136,290.42x = 18,286,833,943.05
5. Step 5: Solve for x
   x = 18,286,833,943.05/136,290.42
6. Step 6: Final answer
   x = 134,175.49