Finding the Fourth Proportional to 139,109.31, 191,971.92 and 75,447.09

Step by Step Solution

1. Step 1: Write the proportion equation
   139,109.31 : 191,971.92 = 75,447.09 : x
2. Step 2: Convert to fraction form
   139,109.31/191,971.92 = 75,447.09/x
3. Step 3: Cross multiply
   139,109.31x = 191,971.92 × 75,447.09
4. Step 4: Simplify right side
   139,109.31x = 14,483,722,725.71
5. Step 5: Solve for x
   x = 14,483,722,725.71/139,109.31
6. Step 6: Final answer
   x = 104,117.57