Finding the Fourth Proportional to 87,426.60, 131,136.79 and 28,260.72

Step by Step Solution

1. Step 1: Write the proportion equation
   87,426.60 : 131,136.79 = 28,260.72 : x
2. Step 2: Convert to fraction form
   87,426.60/131,136.79 = 28,260.72/x
3. Step 3: Cross multiply
   87,426.60x = 131,136.79 × 28,260.72
4. Step 4: Simplify right side
   87,426.60x = 3,706,020,103.89
5. Step 5: Solve for x
   x = 3,706,020,103.89/87,426.60
6. Step 6: Final answer
   x = 42,390.07