Finding the Fourth Proportional to 55,661.47, 76,824.42 and 51,178.12

Step by Step Solution

1. Step 1: Write the proportion equation
   55,661.47 : 76,824.42 = 51,178.12 : x
2. Step 2: Convert to fraction form
   55,661.47/76,824.42 = 51,178.12/x
3. Step 3: Cross multiply
   55,661.47x = 76,824.42 × 51,178.12
4. Step 4: Simplify right side
   55,661.47x = 3,931,729,385.69
5. Step 5: Solve for x
   x = 3,931,729,385.69/55,661.47
6. Step 6: Final answer
   x = 70,636.46