Finding the Fourth Proportional to 248,300.77, 342,631.34 and 139,380.15

Step by Step Solution

1. Step 1: Write the proportion equation
   248,300.77 : 342,631.34 = 139,380.15 : x
2. Step 2: Convert to fraction form
   248,300.77/342,631.34 = 139,380.15/x
3. Step 3: Cross multiply
   248,300.77x = 342,631.34 × 139,380.15
4. Step 4: Simplify right side
   248,300.77x = 47,756,005,153.84
5. Step 5: Solve for x
   x = 47,756,005,153.84/248,300.77
6. Step 6: Final answer
   x = 192,331.28