Finding the Fourth Proportional to 160,300.80, 221,026.56 and 128,444.16

Step by Step Solution

1. Step 1: Write the proportion equation
   160,300.80 : 221,026.56 = 128,444.16 : x
2. Step 2: Convert to fraction form
   160,300.80/221,026.56 = 128,444.16/x
3. Step 3: Cross multiply
   160,300.80x = 221,026.56 × 128,444.16
4. Step 4: Simplify right side
   160,300.80x = 28,389,570,836.89
5. Step 5: Solve for x
   x = 28,389,570,836.89/160,300.80
6. Step 6: Final answer
   x = 177,101.87