Finding the Fourth Proportional to 299,147.72, 448,469.89 and 139,142.35

Step by Step Solution

1. Step 1: Write the proportion equation
   299,147.72 : 448,469.89 = 139,142.35 : x
2. Step 2: Convert to fraction form
   299,147.72/448,469.89 = 139,142.35/x
3. Step 3: Cross multiply
   299,147.72x = 448,469.89 × 139,142.35
4. Step 4: Simplify right side
   299,147.72x = 62,401,152,929.81
5. Step 5: Solve for x
   x = 62,401,152,929.81/299,147.72
6. Step 6: Final answer
   x = 208,596.45