Finding the Fourth Proportional to 100,905.80, 139,251.17 and 55,582.86

Step by Step Solution

1. Step 1: Write the proportion equation
   100,905.80 : 139,251.17 = 55,582.86 : x
2. Step 2: Convert to fraction form
   100,905.80/139,251.17 = 55,582.86/x
3. Step 3: Cross multiply
   100,905.80x = 139,251.17 × 55,582.86
4. Step 4: Simplify right side
   100,905.80x = 7,739,978,009.03
5. Step 5: Solve for x
   x = 7,739,978,009.03/100,905.80
6. Step 6: Final answer
   x = 76,704.99