Finding the Fourth Proportional to 172,089, 257,580.72 and 91,926.54

Step by Step Solution

1. Step 1: Write the proportion equation
   172,089 : 257,580.72 = 91,926.54 : x
2. Step 2: Convert to fraction form
   172,089/257,580.72 = 91,926.54/x
3. Step 3: Cross multiply
   172,089x = 257,580.72 × 91,926.54
4. Step 4: Simplify right side
   172,089x = 23,678,504,360.31
5. Step 5: Solve for x
   x = 23,678,504,360.31/172,089
6. Step 6: Final answer
   x = 137,594.53