Finding the Fourth Proportional to 139,003.57, 191,822.84 and 78,572.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,003.57 : 191,822.84 = 78,572.09 : x
2. Step 2: Convert to fraction form
   139,003.57/191,822.84 = 78,572.09/x
3. Step 3: Cross multiply
   139,003.57x = 191,822.84 × 78,572.09
4. Step 4: Simplify right side
   139,003.57x = 15,071,921,448.54
5. Step 5: Solve for x
   x = 15,071,921,448.54/139,003.57
6. Step 6: Final answer
   x = 108,428.30