Finding the Fourth Proportional to 160,128.37, 220,953.57 and 91,218.43

Step by Step Solution

1. Step 1: Write the proportion equation
   160,128.37 : 220,953.57 = 91,218.43 : x
2. Step 2: Convert to fraction form
   160,128.37/220,953.57 = 91,218.43/x
3. Step 3: Cross multiply
   160,128.37x = 220,953.57 × 91,218.43
4. Step 4: Simplify right side
   160,128.37x = 20,155,037,758.30
5. Step 5: Solve for x
   x = 20,155,037,758.30/160,128.37
6. Step 6: Final answer
   x = 125,868.00