Finding the Fourth Proportional to 208,635.84, 287,915.88 and 113,142.72

Step by Step Solution

1. Step 1: Write the proportion equation
   208,635.84 : 287,915.88 = 113,142.72 : x
2. Step 2: Convert to fraction form
   208,635.84/287,915.88 = 113,142.72/x
3. Step 3: Cross multiply
   208,635.84x = 287,915.88 × 113,142.72
4. Step 4: Simplify right side
   208,635.84x = 32,575,585,794.39
5. Step 5: Solve for x
   x = 32,575,585,794.39/208,635.84
6. Step 6: Final answer
   x = 156,136.10