Finding the Fourth Proportional to 209,131.82, 288,603.74 and 113,638.52

Step by Step Solution

1. Step 1: Write the proportion equation
   209,131.82 : 288,603.74 = 113,638.52 : x
2. Step 2: Convert to fraction form
   209,131.82/288,603.74 = 113,638.52/x
3. Step 3: Cross multiply
   209,131.82x = 288,603.74 × 113,638.52
4. Step 4: Simplify right side
   209,131.82x = 32,796,501,880.06
5. Step 5: Solve for x
   x = 32,796,501,880.06/209,131.82
6. Step 6: Final answer
   x = 156,822.15