Finding the Fourth Proportional to 208,131.35, 287,221.25 and 112,638.05

Step by Step Solution

1. Step 1: Write the proportion equation
   208,131.35 : 287,221.25 = 112,638.05 : x
2. Step 2: Convert to fraction form
   208,131.35/287,221.25 = 112,638.05/x
3. Step 3: Cross multiply
   208,131.35x = 287,221.25 × 112,638.05
4. Step 4: Simplify right side
   208,131.35x = 32,352,040,364.05
5. Step 5: Solve for x
   x = 32,352,040,364.05/208,131.35
6. Step 6: Final answer
   x = 155,440.50