Finding the Fourth Proportional to 55,015.15, 75,918.72 and 31,146.78

Step by Step Solution

1. Step 1: Write the proportion equation
   55,015.15 : 75,918.72 = 31,146.78 : x
2. Step 2: Convert to fraction form
   55,015.15/75,918.72 = 31,146.78/x
3. Step 3: Cross multiply
   55,015.15x = 75,918.72 × 31,146.78
4. Step 4: Simplify right side
   55,015.15x = 2,364,623,669.72
5. Step 5: Solve for x
   x = 2,364,623,669.72/55,015.15
6. Step 6: Final answer
   x = 42,981.32