Finding the Fourth Proportional to 100,968.72, 139,330.56 and 55,644.16

Step by Step Solution

1. Step 1: Write the proportion equation
   100,968.72 : 139,330.56 = 55,644.16 : x
2. Step 2: Convert to fraction form
   100,968.72/139,330.56 = 55,644.16/x
3. Step 3: Cross multiply
   100,968.72x = 139,330.56 × 55,644.16
4. Step 4: Simplify right side
   100,968.72x = 7,752,931,973.53
5. Step 5: Solve for x
   x = 7,752,931,973.53/100,968.72
6. Step 6: Final answer
   x = 76,785.48