Finding the Fourth Proportional to 87,870.20, 131,826.15 and 28,705.77

Step by Step Solution

1. Step 1: Write the proportion equation
   87,870.20 : 131,826.15 = 28,705.77 : x
2. Step 2: Convert to fraction form
   87,870.20/131,826.15 = 28,705.77/x
3. Step 3: Cross multiply
   87,870.20x = 131,826.15 × 28,705.77
4. Step 4: Simplify right side
   87,870.20x = 3,784,171,141.89
5. Step 5: Solve for x
   x = 3,784,171,141.89/87,870.20
6. Step 6: Final answer
   x = 43,065.47