Finding the Fourth Proportional to 139,058.70, 191,899.89 and 78,629.34

Step by Step Solution

1. Step 1: Write the proportion equation
   139,058.70 : 191,899.89 = 78,629.34 : x
2. Step 2: Convert to fraction form
   139,058.70/191,899.89 = 78,629.34/x
3. Step 3: Cross multiply
   139,058.70x = 191,899.89 × 78,629.34
4. Step 4: Simplify right side
   139,058.70x = 15,088,961,696.77
5. Step 5: Solve for x
   x = 15,088,961,696.77/139,058.70
6. Step 6: Final answer
   x = 108,507.86