Finding the Fourth Proportional to 139,005.99, 191,826.20 and 78,574.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139,005.99 : 191,826.20 = 78,574.52 : x
2. Step 2: Convert to fraction form
   139,005.99/191,826.20 = 78,574.52/x
3. Step 3: Cross multiply
   139,005.99x = 191,826.20 × 78,574.52
4. Step 4: Simplify right side
   139,005.99x = 15,072,650,236.42
5. Step 5: Solve for x
   x = 15,072,650,236.42/139,005.99
6. Step 6: Final answer
   x = 108,431.66