Finding the Fourth Proportional to 101,101.79, 139,519.59 and 55,780.18

Step by Step Solution

1. Step 1: Write the proportion equation
   101,101.79 : 139,519.59 = 55,780.18 : x
2. Step 2: Convert to fraction form
   101,101.79/139,519.59 = 55,780.18/x
3. Step 3: Cross multiply
   101,101.79x = 139,519.59 × 55,780.18
4. Step 4: Simplify right side
   101,101.79x = 7,782,427,146.13
5. Step 5: Solve for x
   x = 7,782,427,146.13/101,101.79
6. Step 6: Final answer
   x = 76,976.16