Finding the Fourth Proportional to 101,280.06, 139,764.15 and 55,955.70

Step by Step Solution

1. Step 1: Write the proportion equation
   101,280.06 : 139,764.15 = 55,955.70 : x
2. Step 2: Convert to fraction form
   101,280.06/139,764.15 = 55,955.70/x
3. Step 3: Cross multiply
   101,280.06x = 139,764.15 × 55,955.70
4. Step 4: Simplify right side
   101,280.06x = 7,820,600,848.16
5. Step 5: Solve for x
   x = 7,820,600,848.16/101,280.06
6. Step 6: Final answer
   x = 77,217.58