Finding the Fourth Proportional to 258,649,112.72, 388,145,022.63 and 142,145,827.83

Step by Step Solution

1. Step 1: Write the proportion equation
   258,649,112.72 : 388,145,022.63 = 142,145,827.83 : x
2. Step 2: Convert to fraction form
   258,649,112.72/388,145,022.63 = 142,145,827.83/x
3. Step 3: Cross multiply
   258,649,112.72x = 388,145,022.63 × 142,145,827.83
4. Step 4: Simplify right side
   258,649,112.72x = 55,173,195,559,302,400
5. Step 5: Solve for x
   x = 55,173,195,559,302,400/258,649,112.72
6. Step 6: Final answer
   x = 213,312,912.53