Finding the Fourth Proportional to 80,787.45, 121,236.53 and 28,196.93

Step by Step Solution

1. Step 1: Write the proportion equation
   80,787.45 : 121,236.53 = 28,196.93 : x
2. Step 2: Convert to fraction form
   80,787.45/121,236.53 = 28,196.93/x
3. Step 3: Cross multiply
   80,787.45x = 121,236.53 × 28,196.93
4. Step 4: Simplify right side
   80,787.45x = 3,418,498,111.96
5. Step 5: Solve for x
   x = 3,418,498,111.96/80,787.45
6. Step 6: Final answer
   x = 42,314.72