Finding the Fourth Proportional to 189,915.50, 262,072.78 and 103,857.50

Step by Step Solution

1. Step 1: Write the proportion equation
   189,915.50 : 262,072.78 = 103,857.50 : x
2. Step 2: Convert to fraction form
   189,915.50/262,072.78 = 103,857.50/x
3. Step 3: Cross multiply
   189,915.50x = 262,072.78 × 103,857.50
4. Step 4: Simplify right side
   189,915.50x = 27,218,222,438.49
5. Step 5: Solve for x
   x = 27,218,222,438.49/189,915.50
6. Step 6: Final answer
   x = 143,317.54