Finding the Fourth Proportional to 101,443.18, 139,995.72 and 56,120.38

Step by Step Solution

1. Step 1: Write the proportion equation
   101,443.18 : 139,995.72 = 56,120.38 : x
2. Step 2: Convert to fraction form
   101,443.18/139,995.72 = 56,120.38/x
3. Step 3: Cross multiply
   101,443.18x = 139,995.72 × 56,120.38
4. Step 4: Simplify right side
   101,443.18x = 7,856,613,004.77
5. Step 5: Solve for x
   x = 7,856,613,004.77/101,443.18
6. Step 6: Final answer
   x = 77,448.41