Finding the Fourth Proportional to 101,050.72, 139,443.86 and 55,729.20

Step by Step Solution

1. Step 1: Write the proportion equation
   101,050.72 : 139,443.86 = 55,729.20 : x
2. Step 2: Convert to fraction form
   101,050.72/139,443.86 = 55,729.20/x
3. Step 3: Cross multiply
   101,050.72x = 139,443.86 × 55,729.20
4. Step 4: Simplify right side
   101,050.72x = 7,771,094,762.71
5. Step 5: Solve for x
   x = 7,771,094,762.71/101,050.72
6. Step 6: Final answer
   x = 76,902.91