Finding the Fourth Proportional to 138,667.96, 191,361.83 and 78,251.40

Step by Step Solution

1. Step 1: Write the proportion equation
   138,667.96 : 191,361.83 = 78,251.40 : x
2. Step 2: Convert to fraction form
   138,667.96/191,361.83 = 78,251.40/x
3. Step 3: Cross multiply
   138,667.96x = 191,361.83 × 78,251.40
4. Step 4: Simplify right side
   138,667.96x = 14,974,331,104.06
5. Step 5: Solve for x
   x = 14,974,331,104.06/138,667.96
6. Step 6: Final answer
   x = 107,986.96