Finding the Fourth Proportional to 100,185.91, 138,255.57 and 54,245.33

Step by Step Solution

1. Step 1: Write the proportion equation
   100,185.91 : 138,255.57 = 54,245.33 : x
2. Step 2: Convert to fraction form
   100,185.91/138,255.57 = 54,245.33/x
3. Step 3: Cross multiply
   100,185.91x = 138,255.57 × 54,245.33
4. Step 4: Simplify right side
   100,185.91x = 7,499,719,500.24
5. Step 5: Solve for x
   x = 7,499,719,500.24/100,185.91
6. Step 6: Final answer
   x = 74,858.02