Finding the Fourth Proportional to 49,878.50, 68,838.72 and 28,661.90

Step by Step Solution

1. Step 1: Write the proportion equation
   49,878.50 : 68,838.72 = 28,661.90 : x
2. Step 2: Convert to fraction form
   49,878.50/68,838.72 = 28,661.90/x
3. Step 3: Cross multiply
   49,878.50x = 68,838.72 × 28,661.90
4. Step 4: Simplify right side
   49,878.50x = 1,973,048,508.77
5. Step 5: Solve for x
   x = 1,973,048,508.77/49,878.50
6. Step 6: Final answer
   x = 39,557.09