Finding the Fourth Proportional to 100,216.09, 138,300.42 and 57,194.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,216.09 : 138,300.42 = 57,194.72 : x
2. Step 2: Convert to fraction form
   100,216.09/138,300.42 = 57,194.72/x
3. Step 3: Cross multiply
   100,216.09x = 138,300.42 × 57,194.72
4. Step 4: Simplify right side
   100,216.09x = 7,910,053,933.33
5. Step 5: Solve for x
   x = 7,910,053,933.33/100,216.09
6. Step 6: Final answer
   x = 78,929.98