Finding the Fourth Proportional to 143,865.46, 215,800.20 and 55,123.48

Step by Step Solution

1. Step 1: Write the proportion equation
   143,865.46 : 215,800.20 = 55,123.48 : x
2. Step 2: Convert to fraction form
   143,865.46/215,800.20 = 55,123.48/x
3. Step 3: Cross multiply
   143,865.46x = 215,800.20 × 55,123.48
4. Step 4: Simplify right side
   143,865.46x = 11,895,658,008.70
5. Step 5: Solve for x
   x = 11,895,658,008.70/143,865.46
6. Step 6: Final answer
   x = 82,685.99