Finding the Fourth Proportional to 100,817.06, 139,128.04 and 55,499.58

Step by Step Solution

1. Step 1: Write the proportion equation
   100,817.06 : 139,128.04 = 55,499.58 : x
2. Step 2: Convert to fraction form
   100,817.06/139,128.04 = 55,499.58/x
3. Step 3: Cross multiply
   100,817.06x = 139,128.04 × 55,499.58
4. Step 4: Simplify right side
   100,817.06x = 7,721,547,786.22
5. Step 5: Solve for x
   x = 7,721,547,786.22/100,817.06
6. Step 6: Final answer
   x = 76,589.69