Finding the Fourth Proportional to 113,667.17, 170,648.37 and 87,390.36

Step by Step Solution

1. Step 1: Write the proportion equation
   113,667.17 : 170,648.37 = 87,390.36 : x
2. Step 2: Convert to fraction form
   113,667.17/170,648.37 = 87,390.36/x
3. Step 3: Cross multiply
   113,667.17x = 170,648.37 × 87,390.36
4. Step 4: Simplify right side
   113,667.17x = 14,913,022,487.71
5. Step 5: Solve for x
   x = 14,913,022,487.71/113,667.17
6. Step 6: Final answer
   x = 131,199.04