Finding the Fourth Proportional to 189,142.38, 261,012.60 and 103,100.61

Step by Step Solution

1. Step 1: Write the proportion equation
   189,142.38 : 261,012.60 = 103,100.61 : x
2. Step 2: Convert to fraction form
   189,142.38/261,012.60 = 103,100.61/x
3. Step 3: Cross multiply
   189,142.38x = 261,012.60 × 103,100.61
4. Step 4: Simplify right side
   189,142.38x = 26,910,558,277.69
5. Step 5: Solve for x
   x = 26,910,558,277.69/189,142.38
6. Step 6: Final answer
   x = 142,276.72