Finding the Fourth Proportional to 172,091, 257,583.72 and 91,928.54

Step by Step Solution

1. Step 1: Write the proportion equation
   172,091 : 257,583.72 = 91,928.54 : x
2. Step 2: Convert to fraction form
   172,091/257,583.72 = 91,928.54/x
3. Step 3: Cross multiply
   172,091x = 257,583.72 × 91,928.54
4. Step 4: Simplify right side
   172,091x = 23,679,295,307.37
5. Step 5: Solve for x
   x = 23,679,295,307.37/172,091
6. Step 6: Final answer
   x = 137,597.52