Finding the Fourth Proportional to 208,429.80, 287,631.90 and 117,815.10

Step by Step Solution

1. Step 1: Write the proportion equation
   208,429.80 : 287,631.90 = 117,815.10 : x
2. Step 2: Convert to fraction form
   208,429.80/287,631.90 = 117,815.10/x
3. Step 3: Cross multiply
   208,429.80x = 287,631.90 × 117,815.10
4. Step 4: Simplify right side
   208,429.80x = 33,887,381,061.69
5. Step 5: Solve for x
   x = 33,887,381,061.69/208,429.80
6. Step 6: Final answer
   x = 162,584.15