Finding the Fourth Proportional to 100,726.54, 139,005.24 and 55,405.69

Step by Step Solution

1. Step 1: Write the proportion equation
   100,726.54 : 139,005.24 = 55,405.69 : x
2. Step 2: Convert to fraction form
   100,726.54/139,005.24 = 55,405.69/x
3. Step 3: Cross multiply
   100,726.54x = 139,005.24 × 55,405.69
4. Step 4: Simplify right side
   100,726.54x = 7,701,680,540.79
5. Step 5: Solve for x
   x = 7,701,680,540.79/100,726.54
6. Step 6: Final answer
   x = 76,461.29