Finding the Fourth Proportional to 105,401.50, 157,853.64 and 91,475.20

Step by Step Solution

1. Step 1: Write the proportion equation
   105,401.50 : 157,853.64 = 91,475.20 : x
2. Step 2: Convert to fraction form
   105,401.50/157,853.64 = 91,475.20/x
3. Step 3: Cross multiply
   105,401.50x = 157,853.64 × 91,475.20
4. Step 4: Simplify right side
   105,401.50x = 14,439,693,289.73
5. Step 5: Solve for x
   x = 14,439,693,289.73/105,401.50
6. Step 6: Final answer
   x = 136,997.04