Finding the Fourth Proportional to 128,688.89, 192,967.52 and 53,788.59

Step by Step Solution

1. Step 1: Write the proportion equation
   128,688.89 : 192,967.52 = 53,788.59 : x
2. Step 2: Convert to fraction form
   128,688.89/192,967.52 = 53,788.59/x
3. Step 3: Cross multiply
   128,688.89x = 192,967.52 × 53,788.59
4. Step 4: Simplify right side
   128,688.89x = 10,379,450,547.65
5. Step 5: Solve for x
   x = 10,379,450,547.65/128,688.89
6. Step 6: Final answer
   x = 80,655.38