Finding the Fourth Proportional to 100,418.56, 138,579 and 55,095.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,418.56 : 138,579 = 55,095.72 : x
2. Step 2: Convert to fraction form
   100,418.56/138,579 = 55,095.72/x
3. Step 3: Cross multiply
   100,418.56x = 138,579 × 55,095.72
4. Step 4: Simplify right side
   100,418.56x = 7,635,109,781.88
5. Step 5: Solve for x
   x = 7,635,109,781.88/100,418.56
6. Step 6: Final answer
   x = 76,032.85