Finding the Fourth Proportional to 139,062.57, 191,905.18 and 78,645.08

Step by Step Solution

1. Step 1: Write the proportion equation
   139,062.57 : 191,905.18 = 78,645.08 : x
2. Step 2: Convert to fraction form
   139,062.57/191,905.18 = 78,645.08/x
3. Step 3: Cross multiply
   139,062.57x = 191,905.18 × 78,645.08
4. Step 4: Simplify right side
   139,062.57x = 15,092,398,233.51
5. Step 5: Solve for x
   x = 15,092,398,233.51/139,062.57
6. Step 6: Final answer
   x = 108,529.55