Finding the Fourth Proportional to 208,215.05, 287,336.41 and 112,721.72

Step by Step Solution

1. Step 1: Write the proportion equation
   208,215.05 : 287,336.41 = 112,721.72 : x
2. Step 2: Convert to fraction form
   208,215.05/287,336.41 = 112,721.72/x
3. Step 3: Cross multiply
   208,215.05x = 287,336.41 × 112,721.72
4. Step 4: Simplify right side
   208,215.05x = 32,389,054,353.83
5. Step 5: Solve for x
   x = 32,389,054,353.83/208,215.05
6. Step 6: Final answer
   x = 155,555.78