Finding the Fourth Proportional to 154,636.53, 213,394.79 and 90,978.42

Step by Step Solution

1. Step 1: Write the proportion equation
   154,636.53 : 213,394.79 = 90,978.42 : x
2. Step 2: Convert to fraction form
   154,636.53/213,394.79 = 90,978.42/x
3. Step 3: Cross multiply
   154,636.53x = 213,394.79 × 90,978.42
4. Step 4: Simplify right side
   154,636.53x = 19,414,320,830.43
5. Step 5: Solve for x
   x = 19,414,320,830.43/154,636.53
6. Step 6: Final answer
   x = 125,548.09