Finding the Fourth Proportional to 118,145.79, 177,018.21 and 71,300.25

Step by Step Solution

1. Step 1: Write the proportion equation
   118,145.79 : 177,018.21 = 71,300.25 : x
2. Step 2: Convert to fraction form
   118,145.79/177,018.21 = 71,300.25/x
3. Step 3: Cross multiply
   118,145.79x = 177,018.21 × 71,300.25
4. Step 4: Simplify right side
   118,145.79x = 12,621,442,627.55
5. Step 5: Solve for x
   x = 12,621,442,627.55/118,145.79
6. Step 6: Final answer
   x = 106,829.39