Finding the Fourth Proportional to 101,071.78, 139,472.72 and 55,749.65

Step by Step Solution

1. Step 1: Write the proportion equation
   101,071.78 : 139,472.72 = 55,749.65 : x
2. Step 2: Convert to fraction form
   101,071.78/139,472.72 = 55,749.65/x
3. Step 3: Cross multiply
   101,071.78x = 139,472.72 × 55,749.65
4. Step 4: Simplify right side
   101,071.78x = 7,775,555,342.03
5. Step 5: Solve for x
   x = 7,775,555,342.03/101,071.78
6. Step 6: Final answer
   x = 76,931.02