Finding the Fourth Proportional to 208,628.83, 287,907.86 and 113,135.50

Step by Step Solution

1. Step 1: Write the proportion equation
   208,628.83 : 287,907.86 = 113,135.50 : x
2. Step 2: Convert to fraction form
   208,628.83/287,907.86 = 113,135.50/x
3. Step 3: Cross multiply
   208,628.83x = 287,907.86 × 113,135.50
4. Step 4: Simplify right side
   208,628.83x = 32,572,597,689.81
5. Step 5: Solve for x
   x = 32,572,597,689.81/208,628.83
6. Step 6: Final answer
   x = 156,127.02