Finding the Fourth Proportional to 139,005.57, 191,825.60 and 78,574.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,005.57 : 191,825.60 = 78,574.10 : x
2. Step 2: Convert to fraction form
   139,005.57/191,825.60 = 78,574.10/x
3. Step 3: Cross multiply
   139,005.57x = 191,825.60 × 78,574.10
4. Step 4: Simplify right side
   139,005.57x = 15,072,522,524.96
5. Step 5: Solve for x
   x = 15,072,522,524.96/139,005.57
6. Step 6: Final answer
   x = 108,431.07