Finding the Fourth Proportional to 90,982.58, 136,488.72 and 28,638.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90,982.58 : 136,488.72 = 28,638.50 : x
2. Step 2: Convert to fraction form
   90,982.58/136,488.72 = 28,638.50/x
3. Step 3: Cross multiply
   90,982.58x = 136,488.72 × 28,638.50
4. Step 4: Simplify right side
   90,982.58x = 3,908,832,207.72
5. Step 5: Solve for x
   x = 3,908,832,207.72/90,982.58
6. Step 6: Final answer
   x = 42,962.42