Finding the Fourth Proportional to 258,196.55, 387,145.83 and 100,240.47

Step by Step Solution

1. Step 1: Write the proportion equation
   258,196.55 : 387,145.83 = 100,240.47 : x
2. Step 2: Convert to fraction form
   258,196.55/387,145.83 = 100,240.47/x
3. Step 3: Cross multiply
   258,196.55x = 387,145.83 × 100,240.47
4. Step 4: Simplify right side
   258,196.55x = 38,807,679,769.79
5. Step 5: Solve for x
   x = 38,807,679,769.79/258,196.55
6. Step 6: Final answer
   x = 150,302.86