Finding the Fourth Proportional to 123,804.78, 170,847.79 and 72,807.58

Step by Step Solution

1. Step 1: Write the proportion equation
   123,804.78 : 170,847.79 = 72,807.58 : x
2. Step 2: Convert to fraction form
   123,804.78/170,847.79 = 72,807.58/x
3. Step 3: Cross multiply
   123,804.78x = 170,847.79 × 72,807.58
4. Step 4: Simplify right side
   123,804.78x = 12,439,014,138.25
5. Step 5: Solve for x
   x = 12,439,014,138.25/123,804.78
6. Step 6: Final answer
   x = 100,472.81