Finding the Fourth Proportional to 100,851.68, 139,174.16 and 55,528.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,851.68 : 139,174.16 = 55,528.72 : x
2. Step 2: Convert to fraction form
   100,851.68/139,174.16 = 55,528.72/x
3. Step 3: Cross multiply
   100,851.68x = 139,174.16 × 55,528.72
4. Step 4: Simplify right side
   100,851.68x = 7,728,162,961.88
5. Step 5: Solve for x
   x = 7,728,162,961.88/100,851.68
6. Step 6: Final answer
   x = 76,629.00