Finding the Fourth Proportional to 101,010.57, 139,395.56 and 55,690.31

Step by Step Solution

1. Step 1: Write the proportion equation
   101,010.57 : 139,395.56 = 55,690.31 : x
2. Step 2: Convert to fraction form
   101,010.57/139,395.56 = 55,690.31/x
3. Step 3: Cross multiply
   101,010.57x = 139,395.56 × 55,690.31
4. Step 4: Simplify right side
   101,010.57x = 7,762,981,949.02
5. Step 5: Solve for x
   x = 7,762,981,949.02/101,010.57
6. Step 6: Final answer
   x = 76,853.16