Finding the Fourth Proportional to 208,622.30, 287,900.57 and 113,129

Step by Step Solution

1. Step 1: Write the proportion equation
   208,622.30 : 287,900.57 = 113,129 : x
2. Step 2: Convert to fraction form
   208,622.30/287,900.57 = 113,129/x
3. Step 3: Cross multiply
   208,622.30x = 287,900.57 × 113,129
4. Step 4: Simplify right side
   208,622.30x = 32,569,903,583.53
5. Step 5: Solve for x
   x = 32,569,903,583.53/208,622.30
6. Step 6: Final answer
   x = 156,118.99