Finding the Fourth Proportional to 128,662.08, 193,048.20 and 53,799.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,662.08 : 193,048.20 = 53,799.72 : x
2. Step 2: Convert to fraction form
   128,662.08/193,048.20 = 53,799.72/x
3. Step 3: Cross multiply
   128,662.08x = 193,048.20 × 53,799.72
4. Step 4: Simplify right side
   128,662.08x = 10,385,939,106.50
5. Step 5: Solve for x
   x = 10,385,939,106.50/128,662.08
6. Step 6: Final answer
   x = 80,722.61