Finding the Fourth Proportional to 192,557.85, 288,978.72 and 91,356.31

Step by Step Solution

1. Step 1: Write the proportion equation
   192,557.85 : 288,978.72 = 91,356.31 : x
2. Step 2: Convert to fraction form
   192,557.85/288,978.72 = 91,356.31/x
3. Step 3: Cross multiply
   192,557.85x = 288,978.72 × 91,356.31
4. Step 4: Simplify right side
   192,557.85x = 26,400,029,527.72
5. Step 5: Solve for x
   x = 26,400,029,527.72/192,557.85
6. Step 6: Final answer
   x = 137,101.81