Finding the Fourth Proportional to 100,984.30, 139,351.98 and 55,659.78

Step by Step Solution

1. Step 1: Write the proportion equation
   100,984.30 : 139,351.98 = 55,659.78 : x
2. Step 2: Convert to fraction form
   100,984.30/139,351.98 = 55,659.78/x
3. Step 3: Cross multiply
   100,984.30x = 139,351.98 × 55,659.78
4. Step 4: Simplify right side
   100,984.30x = 7,756,300,758.09
5. Step 5: Solve for x
   x = 7,756,300,758.09/100,984.30
6. Step 6: Final answer
   x = 76,807.00