Finding the Fourth Proportional to 143,318.79, 215,064.59 and 49,890.15

Step by Step Solution

1. Step 1: Write the proportion equation
   143,318.79 : 215,064.59 = 49,890.15 : x
2. Step 2: Convert to fraction form
   143,318.79/215,064.59 = 49,890.15/x
3. Step 3: Cross multiply
   143,318.79x = 215,064.59 × 49,890.15
4. Step 4: Simplify right side
   143,318.79x = 10,729,604,405.34
5. Step 5: Solve for x
   x = 10,729,604,405.34/143,318.79
6. Step 6: Final answer
   x = 74,865.30