Finding the Fourth Proportional to 139,488.21, 209,168.46 and 76,330.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,488.21 : 209,168.46 = 76,330.08 : x
2. Step 2: Convert to fraction form
   139,488.21/209,168.46 = 76,330.08/x
3. Step 3: Cross multiply
   139,488.21x = 209,168.46 × 76,330.08
4. Step 4: Simplify right side
   139,488.21x = 15,965,845,285.28
5. Step 5: Solve for x
   x = 15,965,845,285.28/139,488.21
6. Step 6: Final answer
   x = 114,460.18