Finding the Fourth Proportional to 139,004.13, 191,828.64 and 78,571.17

Step by Step Solution

1. Step 1: Write the proportion equation
   139,004.13 : 191,828.64 = 78,571.17 : x
2. Step 2: Convert to fraction form
   139,004.13/191,828.64 = 78,571.17/x
3. Step 3: Cross multiply
   139,004.13x = 191,828.64 × 78,571.17
4. Step 4: Simplify right side
   139,004.13x = 15,072,200,684.31
5. Step 5: Solve for x
   x = 15,072,200,684.31/139,004.13
6. Step 6: Final answer
   x = 108,429.88