Finding the Fourth Proportional to 57,401.55, 79,274.66 and 51,139.89

Step by Step Solution

1. Step 1: Write the proportion equation
   57,401.55 : 79,274.66 = 51,139.89 : x
2. Step 2: Convert to fraction form
   57,401.55/79,274.66 = 51,139.89/x
3. Step 3: Cross multiply
   57,401.55x = 79,274.66 × 51,139.89
4. Step 4: Simplify right side
   57,401.55x = 4,054,097,392.19
5. Step 5: Solve for x
   x = 4,054,097,392.19/57,401.55
6. Step 6: Final answer
   x = 70,626.97