Finding the Fourth Proportional to 208,128.31, 287,217.43 and 112,635.09

Step by Step Solution

1. Step 1: Write the proportion equation
   208,128.31 : 287,217.43 = 112,635.09 : x
2. Step 2: Convert to fraction form
   208,128.31/287,217.43 = 112,635.09/x
3. Step 3: Cross multiply
   208,128.31x = 287,217.43 × 112,635.09
4. Step 4: Simplify right side
   208,128.31x = 32,350,760,796.03
5. Step 5: Solve for x
   x = 32,350,760,796.03/208,128.31
6. Step 6: Final answer
   x = 155,436.62