Finding the Fourth Proportional to 139,002.75, 191,826.74 and 78,569.79

Step by Step Solution

1. Step 1: Write the proportion equation
   139,002.75 : 191,826.74 = 78,569.79 : x
2. Step 2: Convert to fraction form
   139,002.75/191,826.74 = 78,569.79/x
3. Step 3: Cross multiply
   139,002.75x = 191,826.74 × 78,569.79
4. Step 4: Simplify right side
   139,002.75x = 15,071,786,155.26
5. Step 5: Solve for x
   x = 15,071,786,155.26/139,002.75
6. Step 6: Final answer
   x = 108,427.97