Finding the Fourth Proportional to 5,431.76, 8,156.56 and 5,154.74

Step by Step Solution

1. Step 1: Write the proportion equation
   5,431.76 : 8,156.56 = 5,154.74 : x
2. Step 2: Convert to fraction form
   5,431.76/8,156.56 = 5,154.74/x
3. Step 3: Cross multiply
   5,431.76x = 8,156.56 × 5,154.74
4. Step 4: Simplify right side
   5,431.76x = 42,044,946.09
5. Step 5: Solve for x
   x = 42,044,946.09/5,431.76
6. Step 6: Final answer
   x = 7,740.58