Finding the Fourth Proportional to 139,911.40, 193,066.94 and 78,654.24

Step by Step Solution

1. Step 1: Write the proportion equation
   139,911.40 : 193,066.94 = 78,654.24 : x
2. Step 2: Convert to fraction form
   139,911.40/193,066.94 = 78,654.24/x
3. Step 3: Cross multiply
   139,911.40x = 193,066.94 × 78,654.24
4. Step 4: Simplify right side
   139,911.40x = 15,185,533,631.46
5. Step 5: Solve for x
   x = 15,185,533,631.46/139,911.40
6. Step 6: Final answer
   x = 108,536.78