Finding the Fourth Proportional to 208,131.37, 287,221.28 and 112,638.06

Step by Step Solution

1. Step 1: Write the proportion equation
   208,131.37 : 287,221.28 = 112,638.06 : x
2. Step 2: Convert to fraction form
   208,131.37/287,221.28 = 112,638.06/x
3. Step 3: Cross multiply
   208,131.37x = 287,221.28 × 112,638.06
4. Step 4: Simplify right side
   208,131.37x = 32,352,048,051.51
5. Step 5: Solve for x
   x = 32,352,048,051.51/208,131.37
6. Step 6: Final answer
   x = 155,440.52