Finding the Fourth Proportional to 101,103.49, 139,523.30 and 55,781.47

Step by Step Solution

1. Step 1: Write the proportion equation
   101,103.49 : 139,523.30 = 55,781.47 : x
2. Step 2: Convert to fraction form
   101,103.49/139,523.30 = 55,781.47/x
3. Step 3: Cross multiply
   101,103.49x = 139,523.30 × 55,781.47
4. Step 4: Simplify right side
   101,103.49x = 7,782,814,563.90
5. Step 5: Solve for x
   x = 7,782,814,563.90/101,103.49
6. Step 6: Final answer
   x = 76,978.70