Finding the Fourth Proportional to 208,636.71, 287,916.12 and 113,142.30

Step by Step Solution

1. Step 1: Write the proportion equation
   208,636.71 : 287,916.12 = 113,142.30 : x
2. Step 2: Convert to fraction form
   208,636.71/287,916.12 = 113,142.30/x
3. Step 3: Cross multiply
   208,636.71x = 287,916.12 × 113,142.30
4. Step 4: Simplify right side
   208,636.71x = 32,575,490,584.30
5. Step 5: Solve for x
   x = 32,575,490,584.30/208,636.71
6. Step 6: Final answer
   x = 156,134.99