Finding the Fourth Proportional to 288,043.76, 432,271.38 and 128,162.72

Step by Step Solution

1. Step 1: Write the proportion equation
   288,043.76 : 432,271.38 = 128,162.72 : x
2. Step 2: Convert to fraction form
   288,043.76/432,271.38 = 128,162.72/x
3. Step 3: Cross multiply
   288,043.76x = 432,271.38 × 128,162.72
4. Step 4: Simplify right side
   288,043.76x = 55,401,075,838.95
5. Step 5: Solve for x
   x = 55,401,075,838.95/288,043.76
6. Step 6: Final answer
   x = 192,335.62