Finding the Fourth Proportional to 139,081.30, 208,659.39 and 71,576.55

Step by Step Solution

1. Step 1: Write the proportion equation
   139,081.30 : 208,659.39 = 71,576.55 : x
2. Step 2: Convert to fraction form
   139,081.30/208,659.39 = 71,576.55/x
3. Step 3: Cross multiply
   139,081.30x = 208,659.39 × 71,576.55
4. Step 4: Simplify right side
   139,081.30x = 14,935,119,261.30
5. Step 5: Solve for x
   x = 14,935,119,261.30/139,081.30
6. Step 6: Final answer
   x = 107,384.09